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Call screening device

Telephonic communications – Call or terminal access alarm or control – At substation
Patent

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Call screening in a public telephone station

Telephonic communications – Call or terminal access alarm or control – At substation
Patent

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Caller discrimination within a telephone system

Telephonic communications – Call or terminal access alarm or control – At substation
Patent

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Calling party identifying apparatus and method therefor

Telephonic communications – Call or terminal access alarm or control – At substation
Patent

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Coded phone security system

Telephonic communications – Call or terminal access alarm or control – At substation
Patent

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Communication support system for providing security of...

Telephonic communications – Call or terminal access alarm or control – At substation
Reexamination Certificate

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Communication support system for providing security of...

Telephonic communications – Call or terminal access alarm or control – At substation
Reexamination Certificate

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Communication terminal unit for connection to an ISDN

Telephonic communications – Call or terminal access alarm or control – At substation
Patent

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Controllable annunciator using ring signal

Telephonic communications – Call or terminal access alarm or control – At substation
Patent

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