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

David T. Waugh

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Sound activated transmitter

Communications: electrical – Condition responsive indicating system – With particular coupling link
Patent

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Wireless push button

Equipment for production – distribution – or transformation of ene – Distribution – modification or control – Switch or casing therefor
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Profile ID: LFUS-PAI-P-978666

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