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US Patent: 470,687
Screwdriver
Patentee:
John Koelzer (exact or similar names) - Minneapolis, MN

USPTO Classifications:
81/436

Tool Categories:
screwdrivers : screwdriver handles

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Jas. F. Williamson
E. F. Elmore
Patent Dates:
Applied: Sep. 07, 1891
Granted: Mar. 15, 1892

Patent Pictures:
USPTO (New site tip)
Google Patents
Report data errors or omissions to steward Steve Gosselin
Description:
Bit stock shaft design that facilitates one handed operation.

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