USD232639S - Teaching aid for demonstrating driven harmonic motion - Google Patents

Description

United States Patent ()fiice atented Sept. 3, 1974 TEACHING AID FOR DEMON RATING DRIVEN HARMONIC M 0N FIG. 1 is a front elevational view of a teaching aid for demonstrating driven harmonic motion showing my new design;

FIG. 2 is a side elevational view of the invention taken from the left side of FIG. 1;

FIG. 3 is a top plan elevational view of the invention;

FIG. 4 is a side elevational view taken from the right hand side of device shown in FIG. 1; and

FIG. 5 is a rear elevational iew of the invention shown in FIG. 1.

I claim:

The ornamental design for a teaching aid for demonstrating driven harmonic motion, as shown and described.

PAGE 2 References Cited UNITED STATES PATENTS 5/1973 Stephenson D251 R OTHER REFERENCES Cenco Cat. 1-300, recd Oct. 20, 1961, p. 650, upper left, harmonic motion spring.

MELVIN B. FEIFER, Primary Examiner

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