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US Patent: 139,184
Speed Gage
Patentee:
John W. Osborne - Washington, DC

USPTO Classifications:
73/524

Tool Categories:
industrial tools : rpm speed gauges and tachometers

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Edward W. Donn
Samuel Cassidy

Patent Dates:
Applied: Sep. 03, 1872
Granted: May 20, 1873

Patent Pictures:
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