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Belgium - Curreently 2 Slide Rule Patents

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1st Column

BE/BE358569A
Feb 20, 1930
IMPROVEMENTS IN OR RELATING TO COMBINED CALCULATING AND WRITING INSTRUMENTS
Ruxton Multi-Vider Corp. New York.
BE894047A
REKENBLAADJE
Dhr. Franciscus Cedee
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2nd Column

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3rd Column

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