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US Patent: 420,484
Instrument for Copying Drawings
Patentee:
Ruel W. Whitney (exact or similar names) - San Francisco, San Francisco County, CA

USPTO Classifications:
33/23.05

Tool Categories:
trade specific : draftsman

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Unknown
Patent Dates:
Applied: Aug. 23, 1889
Granted: Feb. 04, 1890

Patent Pictures:
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