Sound level meter

The ornamental design for a sound level meter, substantially as shown.

FIG. 1 is a bottom, left front perspective view of a sound level meter showing our new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a right side elevational view thereof.

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Executed on	Assignor	Assignee	Conveyance	Frame	Reel	Doc
Jan 30 1976		Donaldson Company, Inc.	(assignment on the face of the patent)

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