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			 The ornamental design for a push button switch, substantially as shown and described.  | 
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FIG. 1 is a front elevational view of a push button switch showing my new design, the rear view being a mirror image;
FIG. 2 is a top plan view thereof;
FIG. 3 is a bottom plan view thereof;
FIG. 4 is a left side elevational view thereof;
FIG. 5 is a right side elevational view thereof; and
FIG. 6 is a perspective view thereof.
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| Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc | 
| Mar 07 1986 | Nihon Kaiheiki Kogyo Kabushiki Kaisha | (assignment on the face of the patent) | / | |||
| Jun 15 1988 | SAITO, AKIRA | Nihon Kaiheiki Kogyo Kabushiki Kaisha | ASSIGNMENT OF ASSIGNORS INTEREST | 004903 | /0728 | 
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