Coding and decoding machine

Details Coding and decoding machine Coding and decoding machine

1936-02-25

1979-05-15

Birmiel, Howard A.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340350, 340357, H04L 900

Patent

active

041540069

ABSTRACT:
3. A coding and decoding machine, comprising a plurality of keys each of ch bears a symbol, a plurality of indicating elements each of which represents a symbol on one of said keys, and means to connect each of said keys at random to an indicating element, said means including devices for forming randomly permuting electric circuits between said keys and said indicating elements, operating mechanisms acting at respectively different rates upon different ones of said devices to change said circuits, common driving means for all of said mechanisms, and means for simultaneously disconnecting all of said devices from said devices to permit of setting said devices to desired relative initial positions.

REFERENCES:
patent: 1984599 (1934-12-01), Safar
patent: 2089603 (1937-08-01), Hagelin
patent: 2139676 (1938-12-01), Friedman

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