US Patent: 1,890,923 - Test piece support for hardness testers


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US Patent: 1,890,923

Test piece support for hardness testers

Patentee:

Charles H. Wilson (exact or similar names) - Pelham, NY

USPTO Classifications:

248/297.11, 72/31.01, 73/81, 73/856

Tool Categories:

metalworking tools : machinist tools : measuring tools : metal hardness testers

Assignees:

None

Manufacturer:

Not known to have been produced

Witnesses:

Unknown

Patent Dates:
Applied:	May 15, 1928
Granted:	Dec. 13, 1932

Patent Pictures:

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"Vintage Machinery" entry for Wilson Mechanical Instrument Co.

Description:

It is not known whether this patent was used, but the inventor had established the Wilson Mechanical Instrument Co., Inc., to manufacture Rockwell hardness testers.