500F:
Single line w/ plunger switch to avoid
interference on extensions (or party lines). Lifting the left plunger
activates talk and dial circuits. Cradle is marked, “LIFT
PLUNGER TO DIAL OR TALK”. Replacing the handset resets the
switches. Replaces the 302AA/AC.
501F: Party line w/ plunger switch to connect talk
and dial circuits - to avoid interference with talking party.
Replaces the 306G.
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