An intercom adapter used for selecting optionally one of three popular in-place residential wiring systems, in which two switches, each with two circuit-selecting contacts provide four permutations for selecting a circuit compatible for the in-place residential wiring system, to thereby reduce inventory to only the one switch-operated adapter.

 
Web www.patentalert.com

< Method and apparatus for managing missed-call lists

> System and method of providing DSL services on a telephone network

~ 00452