11
Walter R Pounds: Method of making keyboard assemblies. KB Denver, Hugh H Drake, August 16, 1977: US04042439 (10 worldwide citation)

A keyboard assembly includes an insulative substrate upon which are carried a plurality of conductive paths. Respective portions of the paths are selectively bridged upon depression of a dome-shaped conductive resilient contact element. A pair of space-opposed regions of the dome's marginal portion ...


12
Pounds Walter R: Clavier, Keyboard assembly. Kb Denver, FETHERSTONHAUGH & CO, September 27, 1988: CA1242507

ABSTRACT A keyboard assembly including a plurality of key operatedswitches, each of which includes a dome associated with contactson a printed circuit board which when triggered upon beingsubjected to a triggering force closes the switch and upon beingreleased opens the switch and a keycap or push b ...