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Keep call back device

Telephonic communications – Reception of calling information at substation in wireline... – Blocking caller id transmission
Patent

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Key assembly

Telephonic communications – Terminal – Housing or housing component
Reexamination Certificate

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Key input device

Telephonic communications – Supervisory or control line signaling – Substation originated
Reexamination Certificate

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Key input device

Telephonic communications – Supervisory or control line signaling – Substation originated
Reexamination Certificate

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Key marking overlay for alphanumeric keypads

Telephonic communications – Terminal accessory or auxiliary equipment – Attachable to terminal housing
Patent

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Key telephone apparatus

Telephonic communications – Multi-line or key substation system with selective switching...
Patent

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Key telephone apparatus

Telephonic communications – Multi-line or key substation system with selective switching... – With intercom system
Patent

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Key telephone apparatus

Telephonic communications – Multi-line or key substation system with selective switching... – With special service
Patent

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Key telephone apparatus with [automatic] call...

Telephonic communications – Multi-line or key substation system with selective switching... – Switching or supervision feature
Reexamination Certificate

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Key telephone apparatus with automatic call distribution functio

Telephonic communications – Multi-line or key substation system with selective switching... – Switching or supervision feature
Patent

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Key telephone apparatus with call distribution function

Telephonic communications – Multi-line or key substation system with selective switching...
Reexamination Certificate

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Key telephone apparatus with call distribution function

Telephonic communications – Multi-line or key substation system with selective switching... – Switching or supervision feature
Patent

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Key telephone interface

Telephonic communications – Multi-line or key substation system with selective switching... – Switching or supervision feature
Patent

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Key telephone management system

Telephonic communications – Multi-line or key substation system with selective switching... – With special service
Patent

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Key telephone system

Telephonic communications – Multi-line or key substation system with selective switching... – Switching or supervision feature
Patent

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Key telephone system

Telephonic communications – Multi-line or key substation system with selective switching...
Patent

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Key telephone system

Telephonic communications – Multi-line or key substation system with selective switching... – Line status indication or call alerting
Patent

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Key telephone system

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal
Patent

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Key telephone system

Telephonic communications – Multi-line or key substation system with selective switching...
Patent

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Key telephone system

Telephonic communications – Multi-line or key substation system with selective switching... – Switching or supervision feature
Patent

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