Hardness tester

Details Hardness tester Hardness tester

1997-03-21

1998-05-05

Davis, Antoine Duval

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Weight, force or density

D10 46, 1004

Patent

active

D03940152

REFERENCES:
patent: D250514 (1978-12-01), Etchison
patent: D283599 (1986-04-01), Biddle, Jr. et al.
patent: D351804 (1994-10-01), Kellstedt, Jr. et al.
patent: 5616857 (1997-04-01), Merck, Jr. et al.

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