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US Patent: 230,421
Calipers & Centering Device
Patentee:
Manuel W. Kahle - Duke Centre, PA

USPTO Classifications:
33/674, 33/675

Tool Categories:
layout tools : calipers
layout tools : marking gauges : center marking gauges

Assignees:
Martha Jane Kahle - Duke Centre, PA

Manufacturer:
Not known to have been produced

Witnesses:
Michael J. Stark
George H. Thompson

Patent Dates:
Applied: Jun. 03, 1880
Granted: Jul. 27, 1880

Patent Pictures:
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