Supplemental push button index for use with push button array as on apush button telephone

作者: A Anson

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摘要: An apertured frame is provided which adapted to fit over a push button array, each aperture of the having tab slidably mounted therein and bearing legend may correspond on associated therewith. Each fits its respective be secured thereto by means pressure sensitive adhesive applied underside tab. The tabs array are larger than buttons progressively offset in two dimensions with respect thereby provide array.

参考文章(3)
Laurin L Sevebeck, Elmer C Proehle, Philip J Grunfelder, Multisurface cross point switching mechanisms ,(1960)
Paul U Lind, Pushbutton dialing mechanism ,(1967)