3742157 is referenced by 42 patents and cites 8 patents.

A multiple switch construction for a keyboard or the like produced as a flat panel embodying laminates of electrical conductors in desired patterns, assembled as stratifications in close proximity and separated by spacers. Individual depressible means operating through resilient members urge movable switch elements into contact with fixed electrical conductors with a rotary, wiping action to insure positive electrical contact.

Title
Keyboard switch assembly with improved movable contact
Application Number
05/134,715
Publication Number
3742157
Application Date
April 16, 1971
Publication Date
June 26, 1973
Inventor
Leposavic Wayne V
Assignee
Lematex
IPC
H01h 09/26
H01H 13/702
H01H 13/70
B41J 05/12
B41J 05/00
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