Hardness testing block

Details Hardness testing block Hardness testing block

1986-10-31

1989-11-07

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Weight, force or density

D10 46

Patent

active

D03044270

REFERENCES:
patent: D215069 (1969-08-01), Chriss
patent: D283599 (1986-04-01), Biddle et al.
patent: 3352148 (1967-11-01), Johnson

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