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File:Babbage sign language.jpg

Babbage_sign_language.jpg(384 × 451 pixels, file size: 77 KB, MIME type: image/jpeg)
English: w:Charles Babbage, description of a sign language for mechanical components. From On a method of expressing by signs the action of machinery (1827),
Date 1827
Author Charles Babbage
Public domain This work is in the public domain in the United States, and those countries with a copyright term of life of the author plus 100 years or less.
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