Annunciator system

Claim 1

AN ANNUNCIATOR SYSTEM COMPRISING: (A) A GROUP OF INDICATING MEANS TO BE ASSOCIATED WITH A GROUP OF VARIABLES; (B) EACH OF SAID INDICATING MEANS BEING CAPABLE OF PRODUCING TWO DIFFERENT INDICATIONS; (C) CONTROL CIRCUIT MEANS EFFECTIVE TO PROVIDE DIFFERENT INDICATIONS BY SAID INDICATING MEANS INCLUDING: (1) FIRST AND SECOND SIGNAL RESPONSIVE ELEMENTS EACH HAVING FIRST AND SECOND ELECTRODES, SAID FIRST AND SECOND SIGNAL RESPONSIVE ELEMENTS NORMALLY EXHIBITING A HIGH IMPEDANCE BETWEEN SAID TWO ELECTRODES AND A LOWER IMPEDANCE WHEN A SIGNAL IS APPLIED THERETO, (2) A SWITCHING DEVICE HAVING TWO ELECTRODES, SAID DEVICE NORMALLY EXHIBITING A HIGH IMPEDANCE BETWEEN SAID TWO ELECTRODES AND BEING SWITCHED TO EXHIBIT A LOW IMPEDANCE BETWEEN SAID TWO ELECTRODES RESPONSIVE TO A CONTROL SIGNAL BEING APPLIED TO SAID DEVICE AND REMAINING IN SAID LOW IMPEDANCE STATE SO LONG AS HOLDING CURRENT FLOWS THROUGH SAID TWO ELECTRODES, (3) A FIRST CURRENT PATH COMPRISING THE ELECTRODES OF SAID FIRST AND SECOND SIGNAL RESPONSIVE ELEMENTS CONNECTED IN SERIES, (4) A SECOND CURRENT PATH COMPRISING THE ELECTRODES OF SAID FIRST SIGNAL RESPONSIVE ELEMENT AND THE ELECTRODES OF SAID SWITCHING DEVICE CONNECTED IN SERIES, (5) SAID INDICATING MEANS EFFECTING SAID FIRST ALARM INDICATION RESPONSIVE TO THE FLOW OF CURRENT AT SAID FIRST CURRENT PATH AND EFFECTING SAID SECOND INDICATION RESPONSIVE TO THE FLOW OF CURRENT THROUGH SAID SECOND CURRENT PATH, (6) MEANS EFFECTIVE RESPONSIVE TO THE ASSOCIATED VARIABLE EXHIBITING AN ABNORMAL CONDITION FOR APPLYING SIGNALS TO SAID FIRST AND SECOND SIGNAL RESPONSIVE ELEMENTS TO CAUSE SAID FIRST AND SECOND SIGNAL RESPONSIVE ELEMENTS TO EXHIBIT SAID LOWER IMPEDANCE AND PERMIT CURRENT TO FLOW IN SAID FIRST CURRENT PATH, AND (7) MEANS FOR CONTROLLING THE APPLICATION OF A CONTROL SIGNAL TO SAID SWITCHING DEVICE TO THEREBY CONTROL THE FLOW OF CURRENT IN SAID SECOND CURRENT PATH.