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US Patent: 2,643,460
Hardness Testing Indicator
Patentees:
Harry W. Dietert - Detroit, MI
William P. Adair - Mayfield Heights, OH
Elmer C. Zirzow - Cleveland Heights, OH

USPTO Classifications:
33/542, 73/81

Tool Categories:

Assignees:
Harry W. Dietert Co. - Detroit, MI

Manufacturer:
Not known to have been produced

Witnesses:
none listed

Patent Dates:
Applied: Aug. 09, 1948
Granted: Jun. 30, 1953

Patent Pictures:
USPTO pdf tiff
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Description:
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