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Integrated telephone intercommunication and alarm electronic con

Telephonic communications – Private or single line system – Doorbell system
Patent

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Integrated wireless communication system

Telephonic communications – Private or single line system – Including body or apparel supported terminal
Patent

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Integrated wireless communication system

Telephonic communications – Private or single line system – Including body or apparel supported terminal
Patent

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Integrated wireless communication system

Telephonic communications – Private or single line system – Including body or apparel supported terminal
Patent

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Intercom system

Telephonic communications – Private or single line system – Doorbell system
Patent

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Intercom system for a building or apartment house

Telephonic communications – Private or single line system – Having transducer circuitry
Reexamination Certificate

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Intercom with transducer enclosure to attenuate resonant frequen

Telephonic communications – Private or single line system – Doorbell system
Patent

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Intercommunication system

Telephonic communications – Private or single line system – Doorbell system
Patent

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Internal telephone intercom system

Telephonic communications – Private or single line system – Doorbell system
Patent

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Interphone system

Telephonic communications – Private or single line system – Doorbell system
Patent

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Method and apparatus for broadcasting audio in a...

Telephonic communications – Private or single line system – With paging
Reexamination Certificate

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Method and apparatus for communication with a gate entry...

Telephonic communications – Private or single line system – Doorbell system
Reexamination Certificate

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Method and apparatus for identifying the source of page communic

Telephonic communications – Private or single line system – With paging
Patent

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Method and apparatus for installing telephone intercom--voice me

Telephonic communications – Private or single line system – Doorbell system
Patent

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Method and apparatus for installing telephone intercom-voice mes

Telephonic communications – Private or single line system – Doorbell system
Patent

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Method and apparatus for subscriber line to telephone call...

Telephonic communications – Private or single line system – Having plural stations with selective calling
Reexamination Certificate

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Method and device for access communication/control

Telephonic communications – Private or single line system – Doorbell system
Reexamination Certificate

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Method for influencing a signaling procedure with the assistance

Telephonic communications – Private or single line system – Doorbell system
Patent

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Method of establishing communication link to one of multiple dev

Telephonic communications – Private or single line system – Doorbell system
Patent

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Methods and apparatus for requesting assistance at a...

Telephonic communications – Private or single line system – At booth
Reexamination Certificate

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