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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 130
erodesl&rrrr/?r\ CVOLT •=• 6ROUNO Regenerative Hook-Up Using Two Variometers ^V/tefi/AL … x-fc • * 1000$ S AUDTOTf \TORAG£ \ wr&Y j — G&OUNO Non-Regenerative Hook-Up Using Variometer as Tuner.Radio · Amateur radio stations
Internet Archive · University of Connecticut Library · Public Domain Mark 1.0. Free to use for anything.
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