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US Patent: 1,402,497
Calipers
Patentee:
Walter A. Hoffman - New York, NY

USPTO Classifications:
33/810

Tool Categories:
layout tools : calipers

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Unknown

Patent Dates:
Applied: Jan. 21, 1921
Granted: Jan. 03, 1922

Patent Pictures:
USPTO pdf tiff
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Description:
These calipers feature two dovetail-keyed blocks to hold the arms, with a fine screw-adjust to control the distance. The configurationof the arms allows them to be used for gauging both inside and outside measurements.

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