4. Communications: electrical
  5. Audible indication
  6. Ultrasonic pest control

Harry D. Ferguson

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Electrical simulation of percussive bell

Communications: electrical – Audible indication – Ultrasonic pest control
Patent

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Electrical synthesis of mechanical bell

Communications: electrical – Audible indication – Ultrasonic pest control
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Fire alarm control and emergency communication system

Communications: electrical – Condition responsive indicating system – With particular system function
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Profile ID: LFUS-PAI-P-723608

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