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    • Denver exchange equipment, 1421 Champa St., operators school switchboard

    • Denver exchange equipment, 1421 Champa St., operators school switchboard

    • Women training to be operators work at a switchboard at the Mountain States Telephone and Telegraph Company building at 1421 Champa Street, Denver, Colorado. The women wear headsets and sit in tall chairs that face the switchboard. Supervisors or...

    • Mountain States Telephone and Telegraph Company--1910-1920.; Denver (Colo.)--1910-1920.; Telephone companies--Colorado--Denver--1910-1920.; Telephone operators--Colorado--Denver--1910-1920.; Telephone switchboards--Colorado--Denver--1910-1920.;...

    • 1915

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