Communications: electrical – Land vehicle alarms or indicators – Internal alarm or indicator responsive to a condition of the...
Patent
1979-05-14
1981-03-31
Trafton, David L.
Communications: electrical
Land vehicle alarms or indicators
Internal alarm or indicator responsive to a condition of the...
273 85G, 340799, 340723, 364706, G06F 3153
Patent
active
042596688
ABSTRACT:
A combined home-use-television set/calculator electronic system comprising a control unit for conducting arithmetic calculations and for displaying calculation results on an image screen of the home-use-television set. A keyboard unit is exchangeably connected to the control unit for increasing operation abilities of the combined home-use-television set/calculator electronic system. A read only memory cartridge is exchangeably secured to the control unit. A read only memory corresponding to a selected keyboard unit is secured to the control unit for developing operation instruction signals which are required for performing the arithmetic calculations associated with the selected keyboard unit.
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patent: 4037092 (1977-07-01), Osborne et al.
patent: 4063221 (1977-12-01), Watson et al.
patent: 4095791 (1978-06-01), Smith et al.
patent: 4117469 (1978-09-01), Levine
patent: 4143360 (1979-03-01), Bernhart et al.
Haneda Isamu
Nakagawa Hirohide
Nishimura Kosuke
Sharp Kabushiki Kaisha
Trafton David L.
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