SLIDE RULE CATALOGUE L I T E

 

Sub-List :  BLUNDELL

 

 

 

NAME

MATCH
NR.

DESCRIPTION

Blundell MK. 2 Artillery 10" Mils

2914

Military slide rule of PVC, 330x47x4 mm
Front Scales: ST S A = B C = D T

Blundell & Harling 0490.45 Cocktail MixerF

3545

Food and drink slide chart of plastic, 146x83x2.5 mm

Blundell 0490.75 Concrete Volume computer

5374

Concrete slide chart of plastic, 200x46x2 mm (1970)
Front Scales: See Picture, Back Scales: See Picture

Blundell 100

3828

Generic slide rule of plastic, 139.5x27.5x4 mm
Front Scales: A = B C = D

Blundell 1066 Speed Time Distance

0546

Nautical slide chart of PVC, 176x47x2 mm
Front Scales: 1) = 2) 3) = 4), Back Scales: = 5) =

Blundell 1084 Dead Reckoning Portland

0545

Nautical disc of PVC, 133x154x4 mm (1976)
Front Scales: 1) = 2), Back Scales: 3) = 4)

Blundell 300 Academy

2922

Generic slide rule of co-polymer

Blundell 302 Log - log Academy

0531

Generic slide rule of PVC, 287x46x4 mm
Front Scales: L LL2 LL3 A = B CI C = D S T ST

Blundell 303 Rietz Academy

0532

Generic slide rule of PVC, 287x46.5x4 mm (1958-1970)
Front Scales: L K A = B CI C = D S ST T

Blundell 304 Darmstadt Academy

2923

 

Generic slide rule of PVC

Blundell 305 C Electro Academy

0533

Generic slide rule of PVC, 287x465x35 mm (1958-1970)
Front Scales: 1) EFF GEN.MOT. A = B CI C = D K LL2 LL3, Back Scales: = S L T =

Blundell 308 Accountants Academy

2925

Financial slide rule of PVC

Blundell 310 Academy

2905

Generic disc of PVC, 762 mm (1958-1970)
Front Scales: D = C CI A K

Blundell 310 Descal

2927

 

Generic disc of PVC, 762 mm (1958-1970)
Front Scales: L D = C CI A K

Blundell 312 Simplified Rietz Academy

2926

 

Generic slide rule of PVC

Blundell 315 Descal

3153

Generic disc of PVC, 196x10 mm
Front Scales: LL3 LL2 LL1 D = C CI A K

Blundell 316 Descal

0534

Generic disc of PVC, 196x10 mm
Front Scales: C = D

Blundell 401 Rietz Omega

2939

Generic slide rule of PVC, 297x42x9 mm (1958-1970)
Front Scales: 11inch / K A = B CI C = D L
Back Scales: = S ST T =

Blundell 402 Log - log Omega

2940

Generic slide rule of PVC

Blundell 403 Darmstadt Omega

2942

Generic slide rule of PVC

Blundell 404 Electro Omega

2928

Generic slide rule of PVC

Blundell 405 Omega

2758

Generic slide rule of PVC, 300x42x8 mm (1958-1970)
Front Scales: 11inch / A = B C = D

Blundell 407 Technico Omega

2934

Generic slide rule of PVC

Blundell 409 Mercantile Omega

2933

Financial slide rule of PVC

Blundell 601 Rietz Omega

0536

Generic slide rule of PVC, 159x33x6 mm (1958-1970)
Front Scales: 6inch / K A = B CI C = D L
Back Scales: = S S&T T =

Blundell 605 Omega

2930

Generic slide rule of plastic, 160x33x4 mm
Front Scales: 6inch / A = B C = D

Blundell 606 Omega

3915

Generic slide rule of plastic, 159x33x5 mm
Front Scales: 6in / A = B CI C = D
Back Scales: = S S&T T =

Blundell 800

2759

Generic slide rule of PVC, 306x36x4 mm (1970-1982)
Front Scales: A = B C = D

Blundell 802 Log - log Academy

0537

Generic slide rule of PVC, 330x46.5x4 mm
Front Scales: K LL2 LL3 A = B L CI C = D S T ST

Blundell 803 P (Projection)

0539

Generic projection of perspex, 363x60x5 mm
Front Scales: L K A = B CI C = D S ST T

Blundell 803 Rietz Academy

0538

Generic slide rule of PVC, 331x47x45 mm
Front Scales: L K A = B CI C = D S T ST

Blundell 808 Accountants Academy

2909

Generic slide rule of PVC, 329x46x4 mm (1970-1982)
Front Scales: S LL1 DF = CF IL IR C = D LL3 LL2
Back Scales: M = T =

Blundell 812 Classmate Academy

0540

Generic slide rule of PVC, 172x37x4.5 mm (1970-1982)
Front Scales: S T A = B CI C = D K L

Blundell 813 Classmate Academy

0541

Generic slide rule of PVC, 307x37x4.5 mm (1970-1982)
Front Scales: S T A = B CI C = D K L

Blundell 904 Academy

0542

Generic slide rule of PVC, 319x37x4.3 mm (1975-82)
Front Scales: ST A = B CI C = D S T
Back Scales: K L DF = CF CIF C = D LL2 LL3

Blundell 905 Academy

0543

Generic slide rule of PVC, 329x46.5x4 mm (1975-1982)
Front Scales: LL01 LL02 LL03 A = B L CI C = D LL3 LL2 LL1, Back Scales: K P ST DF = CF CIF CI C = D T S

Blundell AG 1

2970

Generic slide rule of co-polymer

Blundell AG 2

0511

Generic slide rule of co-polymer, 286x37x7 mm
Front Scales: 10inch / K A = B R C = D M
Back Scales: 26cm

Blundell AG 5 RIETZ

2971

Generic slide rule of co-polymer, 286x37x8 mm (1949-1958)
Front Scales: 10inch / K A = B R C = D M
Back Scales: 26cm = S ST T =

Blundell AL 6

0513

Generic slide rule of co-polymer, 284x37x8 mm (1949-1958)
Front Scales: 25cm / U.L. A = B R C = D L.L.
Back Scales: = S ST T = 10inch

Blundell and Harling P 3695 Valve sizing rule

5789

Log/tech slide chart

Blundell B.P - OIL Fuel Viscosity-Temp.

0497

Technical disc of PVC, 144x1 mm
Front Scales: 1) = 2) 3) = 4) 5) = 6) 7) 8) 9) 10)

Blundell Balloon BRL Mark IV A

0328

Meteorology slide rule of PVC, 628x62x12 mm
Front Scales: 1) 2) 3) 4) = K 6) 7) = 8) 9)

Blundell Bearing Rate Mark 1 Model 0

0496

Technical slide rule of PVC, 368x63x6.5 mm
Front Scales: 1) = 2) 3) = 4)

Blundell C 24 Face Cost & Profit Reckoner

2986

Slide rule of PVC

Blundell Cardiovascular Risk Calculator

0498

Medical disc of PVC, 127x1 mm
Front Scales: 1) = 2) + window

Blundell Conversion 0490.37

0503

Conversion slide chart of PVC, 190x77x2 mm (1994)
Front Scales: Side A: 20 scales
Back Scales: Side B: 180 mm 18 scales 7inch

Blundell DM 1 Rietz Instruction rule

2947

Generic slide rule of wood/plastic, 1520 mm
Front Scales: K A = B R C = D M
Back Scales: = S ST T =

Blundell E 13 c Electricians

2870

Electrical slide rule of PVC

Blundell E 25 C

3661

Technical slide rule of plastic, 289x41.5x8.5 mm
Front Scales: 25cm / LL2 A = B R C = D LL3 K #V GEN. EFF. MOT. EFF. GEN. MOT.#, Back Scales: = sin lg tg =

Blundell E 25 Electricians

2983

Electrical slide rule of PVC

Blundell E 3 Electrical

2953

Electrical slide rule of bakelite

Blundell Exchange Rate converter

3158

Financial disc of plastic, 95x1.2 mm
Front Scales: 1) = 2) = 3)

Blundell F 5100 Black Body

3021

Radioactivity slide rule of PVC, 454x90x10 mm
Front Scales: g f 1) e = h j i l k m = d c b a
Back Scales: = n p o r q s =

Blundell FC 3540 Fisher Valve

0556

Log/tech slide rule of PVC, 330x46x4.5 mm (1967)
Front Scales: P %QC2 = P1 1) 2) 3) C1 Q = Cg %QC1
Back Scales: P %QC2 = P1 4) Q = Cv Cg

Blundell G 1 Students

2951

Generic slide rule of bakelite

Blundell G 2

0512

Generic slide rule of bakelite, 285x31x7.5 mm (1947-1949)
Front Scales: K A = B Rec C = D L

Blundell G 22/2

2918

Generic slide rule of PVC, 306x32x7 mm (1950)
Front Scales: A = B C = D

Blundell H Slide Rule

2993

Technical slide rule of PVC, 173x37x4 mm (1968)
Front Scales: 1 2 = 3 4 = 5 6 7 8
Back Scales: 9 10 = 11 12 = 13 14 15

Blundell Hercules C.Mk. 1
6B / 1112682

0515

 

 

Aviation disc of PVC, 178x2.5 mm
Front Scales: 1) 2) = 3)

Blundell Holophane Illumination Calculator

3148

Technical slide rule of bakelite, 290x49x8 mm
Front Scales: 1) 2) = 3) 4) 5) 6) = 7) 8)

Blundell Humidity

2906

Hydrology slide rule of PVC, 33.8x50x5 mm
Front Scales: (4) = (6)(5)(3) )3A) (2B)(2C) (2)(2A) = (1) (1B) (1A), Back Scales: (7)123 = C = D TA TB

Blundell Hygrorule

2693

Meteorology slide rule of PVC, 141x31x5 mm
Front Scales: 1) = 2) = 3), Back Scales: = 4) =

Blundell L 4

3017

Generic slide rule of bakelite, 284x32x8,5 mm (1947-1949)
Front Scales: U.L. A = B Rec C = D L.L.

Blundell L 6

0516

Generic slide rule of bakelite, 285x30x7 mm (1947-1949)
Front Scales: UL A = B Rec C = D LL
Back Scales: = S S&T T =

Blundell Lens Calculator

3157

Photography disc of plastic, 95x1.5 mm
Front Scales: 1) = 2) 3) = 4) = 5) 6)

Blundell Lens Calculator Osprey T.V.

0500

Technical disc of PVC, 86.5x1 mm
Front Scales: 1) 2) = 3) + 1 window with 4) + 5)

Blundell Lincoln MK. 2

1577

Aviation slide rule of bakeliteplastic, 343x63.5x10 mm
Front Scales: Many scales see picture
Back Scales: Many scales see picture page 2

Blundell Management Calculator

3160

Technical disc of plastic, 140x1 mm (1994)
Front Scales: 1) = 2)

Blundell MK 1 Lifeboat Sight Computer 9/4531

0520

Nautical slide chart of PVC, 280x80x25 mm (1956)
Front Scales: 1) 2) 3) = 4) =, Back Scales: = 4) =

Blundell MK 1 Mortar 81 mm

0526

Military disc of PVC, 127x1 mm (1988)
Front Scales: 0 1 2 3 4 5 6

Blundell Mk 2 Artillery Omega 10" Mils

0521

Generic slide rule of PVC, 298x42x8.5 mm (1958-1970)
Front Scales: 1/50000 / A = B C = D
Back Scales: = S ST T =

Blundell MK 3 Artillery 10"

0522

Generic slide rule of PVC, 299x41x8 mm (1958-1970)
Front Scales: A = B C = D, Back Scales: = S ST T =

Blundell MK 6 Humidity

0517

Technical slide rule of PVC, 287x47x9 mm
Front Scales: (4) = (5) (3) (3A) (2B) (2C) = (1) (1B) 1(A)
Back Scales: (7) 1) 2) = (6) (3) (3A) (2) (2A) =

Blundell N 52 (Navigator) Janus

0525

Generic slide rule of PVC, 330x55x5 mm
Front Scales: S1 A = B TA TB ST S C = D K L
Back Scales: 1) 2) 3) 4) 5) = 6) 7) CI 8) 9) C = D SM KM

Blundell NL 11 - 95

0523

 

 

Generic disc of PVC, 95x2 mm (1995)
Front Scales: L D = C CI A

Blundell O.S. 686 A Calculator

2921

 

 

Technical slide rule of PVC, 134x47x3.8 mm (1959)
Front Scales: 1) = 2) = 3)

Blundell P 10

3156

Generic slide rule of co-polymer, 160x33.5x6.5 mm (1948-1958)
Front Scales: 6inch / CUBE A = B REC C = D MAN
Back Scales: = S S&T T = 15cm

Blundell P 1365 Flow of Water in Pipes

2916

Technical slide rule of PVC, 175x47x3.8 mm
Front Scales: X = Y W = Z V

Blundell P 14

2977

Generic slide rule of co-polymer

Blundell P 15

2978

Generic slide rule of co-polymer, 160x32x4.2 mm (1948-1958)
Front Scales: 6inch / A = B REC C = D
Back Scales: = S S&T T = 15cm

Blundell P 1553 Armstrong Calculator

2811

Log/tech slide rule of PVC, 288x47x3.5 mm
Front Scales: S A = B P C = D F

Blundell P 1644 Armstrong Calculator

3407

Log/tech slide rule of PVC, 298x52x8 mm
Front Scales: 11inch / S A = B P C = D F
Back Scales: 1) 2)

Blundell P 17

0524

Generic slide rule of co-polymer, 160x33.8x4.6 mm
Front Scales: 6inch / U.L. A = B R C = D L.L.
Back Scales: = S. S.&T. T. = 15cm

Blundell P 1732 - A Fisher Valve Mark III

0547

Log/tech slide rule of PVC, 254x37x3.5 mm (1963)
Front Scales: VC P D = C 1) 2) Q = Cv 3) Kv
Back Scales: 4) P1 Pc = P 5) 6) 7) 8) Qs Qg = CG CS 9)

Blundell P 1843 Nunn Blood Gas Predictor

0548

Medical slide chart of PVC, 280x57x3 mm (1962)
Front Scales: 1) = 2) = 3) 4) 5) 6) = 7) 8) = 9)
Back Scales: = 10) = = 11) 12) 13) 14) = 15)

Blundell P 2297 Torpedo Spreading Slide Rule

3440

Military slide rule of plastic, 317x162x8 mm
Front Scales: 1) = 2) 3) = 4) 5) = 6) 7) = 8)

Blundell P 2808 Ultrasonic

0550

Log/tech slide rule of PVC, 184x65.6x8 mm (1967)
Front Scales: A = B C = D E = F G = H I
Back Scales: = J K = L M = N = O 5inch 12cm

Blundell P 3241 Rapid Glaze Calculator

0551

Technical disc of PVC, 144x2 mm (1969)
Front Scales: A C = B D

Blundell P 3259

0552

Technical slide rule of PVC, 343x49.5x3.5 mm (1969)
Front Scales: 10inch A B = C D E = F G 1)
Back Scales: 250 mm H I = J K L = M N O 2)

Blundell P 3357 Thermal Expansion of Pipelines

5396

Log/tech slide chart of plastic, 228x48x1.4 mm
Front Scales: See Picture, Back Scales: See Picture

Blundell P 3483 Tarrant Hydraulic Slide Rule

0555

Technical slide rule of PVC, 290x47x4 mm
Front Scales: 1) 2) 3) = 4) 5) 6) = 7)

Blundell P 3512 Textile

2992

Technical slide rule of PVC, 298x43x9 mm
Front Scales: 28cm = 1) = 2) te tb 3) = 4)

Blundell P 3706 Nylon Tube Friction Loss Calculator

3408

Log/tech slide rule of PVC, 338x49x4 mm
Front Scales: 1) = 2) 3) = 4)

Blundell P 3969-77 Textile

2961

Technical slide rule of PVC, 400x108x8.5 mm
Front Scales: 1) 2) 3) 4) = 5) 5) = 6) = 7) 8) = = 9) 10) 11) 12) = 13) 14) 15) 16)

Blundell P 4366 Ultrasonic

2912

Log/tech slide rule of PVC, 245x50x5 mm (1967)
Front Scales: E A D = C B F G = H I
Back Scales: 5inch 12cm L = K J N = M O

Blundell P 4463 Holophane Illuminance and Angle Calculator

2913

Technical slide rule of PVC, 320x37x4 mm
Front Scales: 1) 2) = 3) 4)5) 6) = 7) 8) 9)
Back Scales: 10) = 11) 12) = 13) 14)

Blundell P 4603 MK III Orifice Slide Rule

2915

Technical slide rule of PVC, 318x37x4 mm
Front Scales: m d/D = h rs = N
Back Scales: m d/D = hm Ss = Nm

Blundell P 4740 IFD Cell Reactor

2994

Technical slide rule of PVC, 650x133x8 mm

Blundell P 4743 Fisher Valve

2987

Log/tech slide rule of PVC, 330x46x4.5 mm (1976)
Front Scales: P %QC2 = P1 1) 2) 3) C1 Q = Cg %QC1
Back Scales: P %QC2 = P1 4) Q = Cv Cg

Blundell P 4843 Hydraulic

2920

Technical slide rule of PVC, 330x46x4 mm (9/78)
Front Scales: A B1 B2 = C2 C1 E2 1) 2) 3) E1 = H 4)
Back Scales: B1 B3 = D1 5) 6) D2 F2 F1 = J

Blundell P 5088 The H Slide Rule

0557

Technical slide rule of PVC, 328x46x4 mm (1968)
Front Scales: 1 2 = 3 4 = 5 6 7 8
Back Scales: 9 10 = 11 12 = 13 14 15

Blundell P 5527 Roof Pitch Indicator

5347

Technical slide chart of plastic, 94x103x1.7 mm (1995)
Front Scales: See Picture, Back Scales: See Picture

Blundell P 5597 Hydro Aluminium

0560

Technical disc of PVC, 178x1.5 mm
Front Scales: 1) = 2) + 2 windows
Back Scales: 3) 4) + 1 window

Blundell P 5637 BOC Hospitality Division

3159

Technical slide chart of plastic, 750x360x6 mm
Front Scales: 1) = 2) = 3) = 4) = 5) = 6) = 7)

Blundell P 5705 Torque Calculator

0561

Technical disc of PVC, 147x1.5 mm (1990)
Front Scales: 1) 2) = 3) 4) 5) = 2 windows

Blundell P 5709 Radiography Mk. VI

0562

Technical disc of PVC, 134x3 mm (1954)
Front Scales: 1) 2) = 3) 4) 5) 6) 7) 8) = 9) 10)

Blundell P 5731 Note Tracker

3426

Music slide chart of plastic, 280x115x1.5 mm
Front Scales: Many scales, Back Scales: Many scales

Blundell P 5798 BMI Calculator

0563

Medical disc of PVC, 95x1 mm (1992)
Front Scales: 1) = 2) = 3)

Blundell P 5852 Fuel Oil Preheat

0564

Technical disc of PVC, 156x1 mm (1993)
Front Scales: 1) = 2) 3) = 4) 5) = 6) 7) 8) 9) 10)
Back Scales: 11) = 9 windows

Blundell P 5897 Dalton Aviation Computer

0565

Aviation disc of PVC, 115x134x6 mm
Front Scales: 1) 2) 3) = 4) 5) + 4 windows + 6) 7)
Back Scales: 8) = 9) 10)

Blundell P 5931 Zeneca

3162

Log/tech disc of plastic, 89x210x1 mm

Blundell P 5939 Metric Imperial Price Converter

0502

Technical slide chart of PVC, 190x103x2.5 mm (1995)
Front Scales: Side A: 1) = 2) = 3) = 4) = 5) = 6) = 7) = 8) =, Back Scales: Side B: 9) = 10) = 11) = 12) = 13) = 14) = 15) = 16) =

Blundell P 8

0519

Generic slide rule of bakelite, 159x255x5 mm (1947-1949)
Front Scales: A = B CI C = D
Back Scales: 6inch = = 15cm

Blundell Paper Machine Production Calculator

3913

Log/tech slide rule of plastic, 232x52.5x2.5 mm

Blundell Photographic Interpreters MK II

2908

Photography slide rule of PVC, 335x50x5 mm
Front Scales: A = B CI ST C = D S TA TB
Back Scales: 1) 2) = 3) 4) 5) = 6)

Blundell Popular no. 1

3155

Generic slide rule of PVC, 284x42x3 mm
Front Scales: L K A = B CI C = D S ST T

Blundell Protractor, 6 inch Ivorine 'A' MK. IV

3146

Technical protractor of ivory/metal, 152x51x2 mm
Front Scales: Various see picture
Back Scales: Various see picture

Blundell Radiac no. 1 MK 2

2781

Military disc of PVC, 126x1.5 mm
Front Scales: 1) = 2) = 3)

Blundell Radiac Pat. No. 644944

0504

Log/tech slide rule of PVC, 300x66.5x9 mm
Front Scales: = A1 A2 = B1 B2 = C1 C2 = D
Back Scales: = F1 F2 = = E1 E2 =

Blundell Reproduction

0569

Log/tech disc of PVC, 126x1.3 mm
Front Scales: A = B 1)

Blundell S 100

3833

Generic slide rule of plastic, 139.5x27.5x4 mm
Front Scales: A = B C = D

Blundell S 125

3829

Generic slide rule of plastic, 151x32x2 mm
Front Scales: CUBE A = B REC. C = D MAN.

Blundell S 143 - 10

0528

Generic slide rule of PVC, 305x36x4 mm (1970-1982)
Front Scales: K A = B CI C = D L

Blundell S 143 - 10 (Factory model)

3163

For fabrication plate of metal, 1250x250x3 mm (1970-1982)
Front Scales: K A = B CI C = D L

Blundell S 143 - 20

0529

Generic slide rule of PVC, 172x36x4 mm
Front Scales: K A = B CI C = D L

Blundell S 143 / 5 E

2919

Generic slide rule of PVC, 149x27x2.8 mm (1970-1982)
Front Scales: K A = B CI C = D L

Blundell S 150 - 10

0495

Generic slide rule of PVC, 306x36.8x4 mm
Front Scales: S T A = B CI C = D K L

Blundell S 150 - 10 P (Projection)

2988

Generic projection of perspex, 366x56x5 mm
Front Scales: S T A = B CI C = D K L

Blundell S 150 - 10 Staedtler

3257

Generic slide rule of PVC

Blundell S 150 - 20

0530

Generic slide rule of PVC, 174x37x4 mm (1970-1982)
Front Scales: S T A = B CI C = D K L

Blundell Shackleton MR MK. 3

2344

Aviation slide rule of bakeliteplastic, 344x64.5x11 mm (1978)
Front Scales: Many scales see picture
Back Scales: Many scales see picture page 2

Blundell Students no. 1

3149

Generic slide rule of co-polymer

Blundell T 11 Technicians

2954

Slide rule of co-polymer

Blundell T 12 Technicians

2955

Generic slide rule of PVC

Blundell T 20 Technicians

2969

Generic slide rule of bakeliteco-polymer

Blundell T 50 Janus

2910

Generic slide rule of PVC, 341x45x5.2 mm (1952 1957-1965)
Front Scales: L P A = B T ST S = D DI K, Back Scales: LL01 LL02 LL03 DF = CF CIF CI C = D LL3 LL2 LL1

Blundell Tank Capacity Computer

3409

Log/tech slide chart of plastic, 187x48x2.2 mm
Front Scales: 1) 2) = 3) 4) = 5)

Blundell Turning guide Mitsubishi Carbide

3161

Technical disc of plastic, 146x1 mm
Front Scales: 1) 2) 3) 4)

Blundell U 7

2968

Generic slide rule of bakelite

Blundell V.F. 0129

0527

Generic slide rule of PVC, 285x36.5x6.4 mm
Front Scales: 10inch / A = B C = D
Back Scales: = S ST T =

Blundell Valve Sizing and Flow Foxboro

0506

Technical slide rule of PVC, 151x49x3.5 mm
Front Scales: A) = B) C) = E), Back Scales: = B C =

Blundell Vector Slide Rule

3419

Mathematics complex of plastic/metal

Blundell Victor K MK. 2

2636

Aviation slide rule of PVC, 342x63x10 mm
Front Scales: Many scales see picture
Back Scales: Many scales see picture page 2

Blundell Vulcan B. MK. 2 C.G.

0508

Aviation slide rule of bakeliteplastic, 342x63x10 mm
Front Scales: Many scales see picture
Back Scales: Many scales see picture page 2

Blundell Vulcan B/K. MK. 2 C.G.

0509

Aviation slide rule of bakeliteplastic, 342x63x10 mm
Front Scales: Many scales see picture
Back Scales: Many scales see picture page 2

Blundell W.H. Smith Log - log trig

0501

Generic slide rule of PVC, 330x46x4 mm (1970-1982)
Front Scales: K LL2 LL3 A = B L CI C = D S T ST

Blundell W.H. Smith Rietz

0507

Generic slide rule of PVC, 330x47x4 mm
Front Scales: L K A = B CI C = D S T ST

Blundell W.H. Smith Simplified Rietz

2911

Generic slide rule of PVC, 173x36x4.2 mm (1970-1982)
Front Scales: K A = B CI C = D L