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US Patent: 439,975
Caliper & Centering Gage
Patentee:
William O. Nelson - Baltimore, MD

USPTO Classifications:
33/548, 33/672

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

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
J. Q. A. Sand
T. F. Cavanaugh

Patent Dates:
Applied: Feb. 17, 1890
Granted: Nov. 04, 1890

Patent Pictures:
USPTO pdf tiff
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