Hardness testing block

The ornamental design for a hardness testing block, as shown.

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.

Patent	Priority	Assignee	Title
5150608,	Feb 19 1991	NEWAGE TESTING INSTRUMENTS, INC	Centering device for use with Brinell hardness-measuring probe
5483821,	Feb 19 1991	NEWAGE TESTING INSTRUMENTS, INC	Brinell hardness-measuring probe with centering device
D690705,	Dec 07 2011	SARTORIUS LAB INSTRUMENTS GMBH & CO KG	Panel of a housing of an electronic device
D690706,	Dec 07 2011	SARTORIUS LAB INSTRUMENTS GMBH & CO KG	Panel of a housing of an electronic device
D722900,	Nov 04 2013	King Tester Corporation	Metal hardness tester block having an alphanumeric platted grid
D789816,	Dec 22 2015	King Tester Corporation	Metal hardness test block with alphanumeric grid and circular targets with cross hairs
D790378,	Dec 22 2015	King Tester Corporation	Metal hardness test block with circular targets connected by alphanumeric grid lines
D797588,	Dec 22 2015	King Tester Corporation	Metal hardness test block with targets spaced from alphanumeric grid lines

Patent	Priority	Assignee	Title
3352148,
215069,
D283599,	Aug 29 1983	King Tester Corporation	Material hardness tester or similar article

Executed on	Assignor	Assignee	Conveyance	Frame	Reel	Doc
Oct 30 1986	BIDDLE, ERNEST L	KING TESTER CORPORATION, A CORP OF PA	ASSIGNMENT OF ASSIGNORS INTEREST	004660	0486	pdf
Oct 31 1986		King Tester Corporation	(assignment on the face of the patent)

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