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Description
Numbered parts. Possibly coils that are part of an experiment to put carrier current information on to an electric power line. Photograph has numbered PT-98. A cyanotype copy is included.
Type
image
Format
Black & White
Identifier
CF450A25-A56E-46C3-92BE-297926794891 2003-36-148b
Subject
Radio--Transmitters and transmission (LCSH) Radio--Equipment and supplies (LCSH) Federal Telegraph Company
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