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Description
Coil wound around a power line, connected to test device. May be part of an experiment to put carrier current information on to an electric power line. Photograph is numbered PT-99. A cyanotype copy is included.
Type
image
Format
Black & White
Identifier
47808271-DCE8-4250-96EF-547230242230 2003-36-148c
Subject
Radio--Transmitters and transmission (LCSH) Radio--Equipment and supplies (LCSH) Federal Telegraph Company Electric utilities (LCSH) Electric wire (LCSH) Power and signal transmission devices (LCSH) Electric currents (LCSH)
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