Material hardness tester or similar article

Measuring – testing – or signalling instruments – Measuring – regulating or indicating instrument – or casing – Food preparation type

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D10 83

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D02835991

REFERENCES:
patent: D178060 (1956-06-01), Karol
patent: D223174 (1972-03-01), Pettavel
patent: 1646195 (1927-10-01), German
patent: 2319208 (1943-05-01), Clark
patent: 2418916 (1947-04-01), Weaver
patent: 2535830 (1950-12-01), Beck
patent: 2804769 (1957-09-01), Clark, Sr.
patent: 3102417 (1963-09-01), Chambers
patent: 3478568 (1969-11-01), Borgersen

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