English: Left (switchboard) side of the Tel-musici music room in Wilmington, Delaware, 1909. The Tel-musici was an early entertainment innovation, which used telephone lines to transmit phonograph recordings to individual households.
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From page 699 of the December 18, 1909 issue of Telephony magazine, in the article "Distributing Music Over Telephone Lines"
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Telefonistes bij het telefoonschakelbord voor het doorgeven van grammofoonmuziek via telefoonlijnen. (Delaware 1909.)