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US Patent: 1,145,042
Calculating Device
Patentee:
Jacob M. Spitzglass - Chicago, Cook County, IL

USPTO Classifications:
235/70A, 235/70R

Tool Categories:
specialty tools : slide rules : scales

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Unknown

Patent Dates:
Applied: Jul. 01, 1914
Granted: Jul. 06, 1915

Patent Pictures:
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