CRYPTOGUARD

Electronic Transmitters Used for the Transmission of Coded Signals Over Communication Lines or Paths to a Receiver on which Legible Signals Are Displayed for Action by the Receiver Custodian of the Burglar or Fire Alarm Control Units and Electro-Mechanical Locks which Are Operated Electronically Using Cryptic Transmissions of Electrical Energy to Activate Mechanical Walks or Solenoids Forming Part of the Mechanism Designed for Use with and to Increase the Security Provided by, Burglar Resistive Equipment and Fire, Intrusion and Access Control Systems