Hardness testing apparatus

Details Hardness testing apparatus Hardness testing apparatus

1993-04-26

1995-03-21

Douglas, Alan P.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Electrical property

Patent

active

D03565157

REFERENCES:
patent: D283599 (1986-04-01), Biddle, Jr. et al.
patent: 3102417 (1963-09-01), Chambers
patent: 3757567 (1973-09-01), Worden
patent: 4118975 (1978-10-01), Iwasaki

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