Hardness testing block

- King Tester Corporation
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Description

FIG. 1 is a top plan view of a hardness testing block showing my new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a top right-front perspective view thereof.

Referenced Cited
U.S. Patent Documents
D215069 August 1969 Chriss
D283599 April 29, 1986 Biddle et al.
3352148 November 1967 Johnson
Patent History
Patent number: D304427
Type: Grant
Filed: Oct 31, 1986
Date of Patent: Nov 7, 1989
Assignee: King Tester Corporation (King of Prussia, PA)
Inventor: Ernest Biddle (Rosemont, PA)
Primary Examiner: Nelson C. Holtje
Application Number: 6/926,233