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US Patent: 906,902
Speed-change gear
Patentee:
George O. Leopold (exact or similar names) - Philadelphia, PA

USPTO Classifications:
74/366, 81/34

Tool Categories:
woodworking tools : hand drills : eggbeater drills

Assignees:
North Brothers Manufacturing Co. - Philadelphia, PA

Manufacturer:
North Brothers Manufacturing Co. - Philadelphia, PA

Witnesses:
William E. Shupe
William A. Barr

Patent Dates:
Applied: Jan. 22, 1908
Granted: Dec. 15, 1908

Patent Pictures:
Leopold 906,902
USPTO (New site tip)
Google Patents
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Description:
The competition heats up as North Brothers enters the 20th century with novel approaches to the breast drill. The mechanisms on the North Bros. breast drills are still considered the best by many.

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