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US Patent: 1,571,641
Gauge for Determining Internal Diameter of Elements Being Gound
Patentee:
Frederick J. Pratt (exact or similar names) - Detroit, Wayne County, MI

USPTO Classifications:
33/805

Tool Categories:
metalworking machines : grinders : grinding attachments
metalworking tools : machinist tools : measuring tools : limit gages

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Unknown
Patent Dates:
Applied: Jan. 17, 1924
Granted: Feb. 02, 1926

Patent Pictures:
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