Old Keyboard Key Switches
not a complete list, but i begin to collect and sort out.
Ancient Switches
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Invac PK-200, 1966 Invac Optical switch -
Univac, 1971 Univac Magnetic Separation Switch -
ITW Magnetic Valve Switch 1975 -
IBM 5251, 1977 beam spring switch -
Buckling Spring Key Switch 1980s -
Hi-Tek 725 Switch (Space Invader Switch) 1983 -
Keyboard Cherry MX Switches 1983
