4. Communications: electrical
  5. Condition responsive indicating system
  6. With particular system function

John J. Bosnak

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Electronic siren

Communications: electrical – Audible indication – Ultrasonic pest control
Patent

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Method of and apparatus for the testing of warning systems

Communications: electrical – Condition responsive indicating system – With particular system function
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Strobe power supply

Electric lamp and discharge devices: systems – Condenser in the supply circuit – Condenser in shunt to the load device and the supply
Patent

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Switching amplifier and electronic siren employing the same

Communications: electrical – Audible indication – Ultrasonic pest control
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Profile ID: LFUS-PAI-P-188356

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