The window card code

Article Abstract:

The window card code uses a piece of cardboard with small rectangular openings cut into it to decode secret messages written on a sheet of paper. Instructions for using it to code and decode messages are presented.

Author: Miller, Marvin

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The telephone code

Article Abstract:

Instructions are presented for using the letters and numbers on push-button telephones to write a message in a secret code and to decode a secret message.

Author: Miller, Marvin

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Subjects list: Methods, Codes, Ciphers
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