Patented and Distinctive Bit Braces & Augers, a Research Study
by
George Langford, Sc.D.
Updated December 9, 2016
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Generic brace(s)
American manufacturers with adequate resources could economically have their engineers and legal representatives examine proposed tool designs with a view towards picking long-used designs known for their ruggedness and ease of manufacture while avoiding infringement of active patents. Therefore, the principal marking is usually Made in U.S.A.

Inventor/Maker
Representative Images
(can be enlarged)
Examples
found by GB

Patent
Patent Date
Directory of American
Toolmakers: active years

Expired/Unknown
Chuck apart
29 expired
expired
Post-Depression