USD304427SExpiredUtility

Hardness testing block

57
Assignee: KING TESTER CORPPriority: Oct 31, 1986Filed: Oct 31, 1986Granted: Nov 7, 1989
Est. expiryOct 31, 2006(expired)· nominal 20-yr term from priority
Inventors:Ernest L. Biddle
57
PatentIndex Score
8
Cited by
2
References
1
Claims

Claims

exact text as granted — not AI-modified
The ornamental design for a hardness testing block, as shown.

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