Corrosion testing instrument

The ornamental design for a corrosion testing instrument, as shown and described.

FIG. 1 is a left front perspective view of a corrosion testing instrument showing my new design; the right side being identical;

FIG. 2 is a front elevational view thereof, the rear being flat, plain and unornamented; and

FIG. 3 is a cross-sectional view thereof as taken from line III--III of FIG. 2.

The top and bottom of the instrument are flat, plain, and unornamented.

Patent	Priority	Assignee	Title
D270902,	Jun 01 1981	Analtech, Incorporated	Chromatography chamber

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Executed on	Assignor	Assignee	Conveyance	Frame	Reel	Doc
Dec 11 1978		IPM Corporation	(assignment on the face of the patent)
Aug 16 1984	IPM CORPORATION A CORP OF PA	THERMCO SYSTEMS, INC	ASSIGNMENT OF ASSIGNORS INTEREST	004290	0153	pdf
Jun 29 1987	THERMCO SYSTEMS, INC	KEYSTONE CARBON COMPANY, A PA CORP	ASSIGNMENT OF ASSIGNORS INTEREST	004779	0678	pdf
Jun 29 1987	ALLEGHENY INTERNATIONAL, INC	KEYSTONE CARBON COMPANY, A PA CORP	ASSIGNMENT OF ASSIGNORS INTEREST	004779	0678	pdf

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