Roger Isaacs - Brooklyn NY Albert Stern - Brooklyn NY
International Classification:
G08B 522
US Classification:
340224
Abstract:
A radio intrusion alarm system utilizing a high frequency carrier signal having an audio subcarrier which may be modulated by two tone signals, the first tone signal causing actuation of an alarm, the second tone signal causing actuation of a time delay means which inhibits operation of the alarm to permit an authorized entry, for example, at the transmitter location without giving the alarm.
Sir Albert Gerald Stern (18781966) was a banker who became the Secretary of the Landships Committee during World War I, where his organisational ability and