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VEHICLE ALERTING SYSTEM

  • US 3,673,560 A
  • Filed: 05/21/1970
  • Issued: 06/27/1972
  • Est. Priority Date: 05/21/1970
  • Status: Expired due to Term
First Claim
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1. In an alarm system for emergency vehicles, a plurality of transmitter sections, each said transmitter section comprising:

  • an antenna;

    a transmitter connected to excite said antenna;

    signal generating encoder means for modulating said transmitter, said encoder means having a different duty cycle than, and being adapted to operate in non-synchronism with respect to the signal generating encoder means of any other transmitter section in said system.

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