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Revolving alphanumeric dial created by Francis Ronalds as part of his electric telegraph (1816). In the public domain.

Published April 11, 2018 at 1280 × 1255 in Revolving alphanumeric dial created by Francis Ronalds as part of his electric telegraph (1816). In the public domain..

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Revolving alphanumeric dial created by Francis Ronalds as part of his electric telegraph (1816). In the public domain.

Revolving alphanumeric dial created by Francis Ronalds as part of his electric telegraph (1816). In the public domain.

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