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Patent number:
Patent Date:
Patents for Otto Freund Jr.
Patents 1 - 2 of 2
Picture
Number
Date
Patentee
Title
1,150,771
Aug. 17, 1915
W.L. Keuffel
Slide rule runner
1,181,672
May 02, 1916
W.L. Keuffel
Slide rule runner
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