Calculator

Details Calculator Calculator

1988-07-15

1990-01-09

Fuller, B. R.

Registers

Miscellaneous

Numeral wheels

235 1R, 235145R, 200 5A, 200293, 206565, 364708, G06C 502

Patent

active

048929999

ABSTRACT:
A see-through calculator or memory device comprises a transparent base, a see-through printed circuit board and a transparent switch panel. Liquid is housed in a cavity in the base, formed by welding to the base a panel above a recess in the base.

REFERENCES:
patent: 4078257 (1978-03-01), Bagley
patent: 4441001 (1984-04-01), Miyano et al.
patent: 4517421 (1985-05-01), Margolin

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