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US Patent: 832,203
Calipers
Patentees:
Emil Kohler (exact or similar names) - Chemnitz, Germany
Richard Petzold (exact or similar names) - Chemnitz, Germany

USPTO Classifications:
33/558.04

Tool Categories:
layout tools : calipers

Assignees:
None

Manufacturer:
Rochester Experimental - Rochester, NY

Witnesses:
Morris Lipman
Frederick J. Sietzman
F. Heesen
L Waldman

Patent Dates:
Applied: Jun. 26, 1904
Granted: Oct. 02, 1906

Patent Pictures: [ 1 | 2 ]
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Description:
These calipers feature a short third arm that one of the legs can register against. This allows one arm rotated out of the way, then returned to its original position accurately, to accomodate measuring around obstacles.

Known examples are marked with the manufacturer name and "Patented EK".

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