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US Patent: 1,879,398
Gauge for Sizing Internal Threads
Patentee:
George E. Mirfield (exact or similar names) - Youngstown, OH

USPTO Classifications:
33/199R, 33/542

Tool Categories:
layout tools : measurement gauges

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
F. J. Hartman
Patent Dates:
Applied: Jun. 22, 1929
Granted: Sep. 27, 1932

Patent Pictures:
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