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US Patent: 1,410,189
Calipers, Spring-Calipers and the Like
Patentee:
Robert Johnson (exact or similar names) - New Bedford, MA

USPTO Classifications:
33/801

Tool Categories:
layout tools : calipers

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
H. Woodard
Patent Dates:
Applied: Feb. 14, 1921
Granted: Mar. 21, 1922

Patent Pictures:
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Report data errors or omissions to steward Ralph Brendler
Description:
These calipers use a secondary gauging arm attached to a scale for measuring the opening.

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