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Text enhanced telephony

Telephonic communications – Including aid for handicapped user
Patent

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Text enhanced telephony

Telephonic communications – Including aid for handicapped user
Reexamination Certificate

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Text enhanced telephony

Telephonic communications – Including aid for handicapped user
Patent

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Text teletype writer with caller identification function

Telephonic communications – Including aid for handicapped user
Patent

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TTY communication over packet networks

Telephonic communications – Including aid for handicapped user
Reexamination Certificate

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TTY enhancement of busy condition prompt

Telephonic communications – Including aid for handicapped user
Reexamination Certificate

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TTY enhancement of busy condition prompt

Telephonic communications – Including aid for handicapped user
Reexamination Certificate

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TTY messaging

Telephonic communications – Including aid for handicapped user
Reexamination Certificate

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TTY telephone display and related processes systems and apparatu

Telephonic communications – Including aid for handicapped user
Patent

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Video relay system and method

Telephonic communications – Including aid for handicapped user
Reexamination Certificate

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Voice and text transmission system

Telephonic communications – Including aid for handicapped user
Reexamination Certificate

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