4. Communications: electrical
  5. Systems
  6. Manual alarm telegraph; e.g., other than signal box type
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Alarm station protector capable of being accessed by disabled in

Communications: electrical – Systems – Manual alarm telegraph; e.g. – other than signal box type
Patent

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Apparatus and method for activating a non-contact switch...

Communications: electrical – Systems – Manual alarm telegraph; e.g. – other than signal box type
Reexamination Certificate

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Apparatus for fire protection

Communications: electrical – Systems – Manual alarm telegraph; e.g. – other than signal box type
Patent

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