Originally the Post Office called their bells and bellsets by a name only.
It was later that they adopted the method of naming equipment by a simple
description followed by a number.
BELL, MAGNETO 100ohm
BELL, MAGNETO 1000ohm
BELL, MAGNETO WITH INDUCTION COIL AND
RELAY
BELLSET, MAGNETO C.B.
BELLSET, MAGNETO 2/2 C.B.
BELL, TREMBLER, 3 TERMINAL,
CIRCULAR 25ohm
BELL, TREMBLER, 3 TERMINAL,
CIRCULAR 100ohm
BELL, TREMBLER, HOUSE 2.5"
BELL, TREMBLER, INDICATOR,
LARGE
BELL, TREMBLER, SMALL
BELLSET, TREMBLER
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