electro-mechanical alarm telephone keys

摘要

ALARM ELECTRO-MECHANICS FOR touchtone telephone, essentially characterized in that it comprises A PROGRAMMER (2) DISCO, FITTED WITH VARIOUS HOLES (7), DESTINED TO RECEIVE SOME BALLS ESTABLISHING THE COMBINATION OF NUMBERS desired PULSAR, providing KEY alarm signal (8), to a control center O SOUND ACOUSTIC THROUGH A BELL (11) or similar.