Teaching aid for ultrasound wave theory

The ornamental design for a teaching aid for ultrasound wave theory, as shown and described.

FIG. 1 is a front perspective view of a teaching aid for ultrasound wave theory showing my new design;

FIG. 2 is a front elevational view;

FIG. 3 is a rear elevational view; and,

FIG. 4 is a side elevational view, the opposite side being a mirror image thereof.

Patent	Priority	Assignee	Title
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Executed on	Assignor	Assignee	Conveyance	Frame	Reel	Doc
Oct 01 1996		Joseph S., Powell	(assignment on the face of the patent)

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