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INTERNAL TELEPHONE, 1920's

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INTERNAL TELEPHONE, 1920's

A small wooden telephone used in offices or coal mines for one to one communication. Two units and a small battery is all that is required to work these units. Working with this instrument in coal mines could be a problem if there was gas around, never the less such units were seen in mines in the early days of Telephones. Strict rules would apply to their use but communication was as important as safety and the position of the instrument was carefully considered.

Known as a 'Direct Line Wall Telephone Set'

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