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US Patent: 418,493
Combined File and Try Square
John W. Boughton - Philadelphia, PA
John M. Snidow - Big Stony Creek, VA

USPTO Classifications:
33/418, 33/495, 7/163

Tool Categories:
layout tools : squares : try squares
metalworking tools : files

John W. Boughton - Philadelphia, PA

Not known to have been produced

John A. Wiedersheim
A. P. Jennings
F. G. Thrasher
T. T. Phlegar

Patent Dates:
Applied: Sep. 06, 1889
Granted: Dec. 31, 1889

Patent Pictures:
USPTO pdf tiff
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