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US Patent: 51,517
Improvement in Calipers
Combination Calipers and Level
Patentee:
Benjamin Green Martin - Philadelphia, PA

USPTO Classifications:
33/801

Tool Categories:
layout tools : calipers
layout tools : levels : pendulum levels

Assignees:
Watson Sanford - Philadelphia, PA
LLoyd H. Walton - Philadelphia, PA
Thos. M. Davis - Philadelphia, PA
Benjn. G. Martin - Philadelphia, PA

Manufacturer:
Unknown

Witnesses:
Benjn. Morrison
B. F. Shattuck

Patent Dates:
Granted: Dec. 12, 1865

Patent Pictures: [ 1 | 2 ]
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Description:
This is a set of machinist calipers which features a swinging indicator to allow it to act as a simple pendulum level.

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