Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1983-07-15
1987-05-19
Caldwell, Sr., John W.
Communications: electrical
Audible indication
Percussion-type sound producer
340365C, 34082579, G06F 302
Patent
active
046671811
ABSTRACT:
A keyboard assembly is disclosed in which complementary arrays of first and second switch contacts are connected in equal sets and each set of first contacts is connected to a separate set of second contacts through a diode so that the connected sets of contacts do not contain contacts from the same switch, thus permitting keyboard terminals individually associated with the connected sets of first and second contacts to be sequentially enabled while reading the unenabled terminals to determine actuated switches.
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Caldwell Sr. John W.
Fatahi-Yar Mahmoud
Honeywell Inc.
Rubow Charles L.
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