Telegraph engineering : a manual for practicing telegraph engineers and engineering students (1922)
Hausmann, Erich, 1886- · New York : D. Van Nostrand Company · leaf 156
RESISTANCE LAMP (3-12 OHMS PER VOLT) JACKS I JACKSLZ y^n y=^n J=^n *c=^ 0 - CLOSED BATTERY GROUPS 20 - TWO-WIRE TRUNKS (FROM ONE■ END OF BOARD TOOTHER) POLE CHANGER … SOUNDER OFI^ICE LOOP50- DUPLEX OR QUAD. SETS AND OFFICE LOOPS 5 T
Telegraph
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
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