NASA NTRS · 19840000254
Improved Optical Keyboard
Abstract
Optical keyboard surfaces used in typewriters, computer terminals, and telephone inexpensively fabricated using stack of printed-circuit cards set in laminate. Internal laminations carry all illuminating and sensing light conductors to keys.
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Jamieson, R. S.. 1985-04-01. Improved Optical Keyboard. https://ntrs.nasa.gov/citations/19840000254
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