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US Patent: 470,176
Mechanical movement
Patentee:
Frank P. Burkhardt (exact or similar names) - Spokane Falls, WA

USPTO Classifications:
74/127, 74/424.75, 74/89.45

Tool Categories:
screwdrivers : screwdriver mechanisms : spiral screwdrivers

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
William Zimmerman
T. E. Vogel
Patent Dates:
Applied: Mar. 01, 1890
Granted: Mar. 08, 1892

Patent Pictures:
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