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Redundant operation of ring voltage generators utilizing...

Telephonic communications – Call signal generating
Reexamination Certificate

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Ring signal generator for generating ring signals of different f

Telephonic communications – Call signal generating
Patent

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Ringer circuit

Telephonic communications – Call signal generating
Reexamination Certificate

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Ringing circuit

Telephonic communications – Call signal generating
Patent

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Ringing circuit for use in portable telephone set

Telephonic communications – Call signal generating
Patent

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Ringing generator for telephones

Telephonic communications – Call signal generating
Patent

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Ringing signal generator

Telephonic communications – Call signal generating
Patent

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