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US Patent: 486,070
Calculating Instrument
Patentee:
George M. Andrews (exact or similar names) - Boston, Suffolk County, MA

USPTO Classifications:
235/67

Tool Categories:

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Unknown
Patent Dates:
Applied: Feb. 20, 1892
Granted: Nov. 15, 1892

Patent Pictures:
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