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Amateur radio : how and why of wireless with complete instructions on operation of receiving outfits (1922)
Grainger, Maurice J · New York : James A. McCann · leaf 138
INDUCTIVE CDUHMRJMTH VARIABLE COUPLING … LOOP. AERIALRadio · Amateur radio stations
Internet Archive · University of Connecticut Library · Public Domain Mark 1.0. Free to use for anything.
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