Windowed rotatable cover which reveals one indicia on one surfac

Details Windowed rotatable cover which reveals one indicia on one surfac Windowed rotatable cover which reveals one indicia on one surfac

1990-04-09

1991-09-03

Tarcza, Thomas H.

Cryptography

Selectively movable element having code characters

Rotatable

380 56, 283 94, 283 73, G09C 106

Patent

active

050460960

ABSTRACT:
A simple and inexpensive apparatus for encoding and decoding messages is disclosed. The apparatus comprises a first surface having a first series of indicia and a second surface having a series of letters. Each of the letters correspond to a unique one of the indicia. The device further includes a cover for rotating one of the surfaces through a plurality of positions and sequentially revealing one of the indicia and its corresponding letter.

REFERENCES:
patent: 197199 (1877-11-01), Baldwin
patent: 1271000 (1918-07-01), Wulf
patent: 1441109 (1923-01-01), Newel
patent: 2533384 (1950-12-01), Martinez
patent: 2668369 (1954-02-01), Hepp

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