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TELEPHONE ALARM SYSTEM WHERE A CENTRAL STATION ALERTS A PRESELECTED AGENCY IN RESPONSE TO A RECEIVED PULSE CODED FREQUENCY SIGNAL IDENTIFYING A PARTICULAR ALARM CONDITION AT A PARTICULAR SUBSCRIBER STATION

  • US 3,492,426 A
  • Filed: 03/18/1965
  • Issued: 01/27/1970
  • Est. Priority Date: 03/18/1965
  • Status: Expired due to Term
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