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US Patent: 189,265
Improvement in Gimlets and Twist-Drills
Julius C. Richardson - Philadelphia, PA

USPTO Classifications:
72/371, 74/412, 76/108.6

Tool Categories:
tool making : making drills and augers
woodworking tools : hand drills : gimlets
woodworking tools : hand drills : drill bits : twist drill bits

Julius C. Richardson - Philadelphia, PA
Thomas Hooker - Syracuse, NY

Not known to have been produced

John A. Wiedersheim
H. E. Hindmarsh

Patent Dates:
Applied: Sep. 07, 1876
Granted: Apr. 03, 1877

Patent Pictures:
USPTO pdf tiff
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