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Telephone apparatus

Telephonic communications – Supervisory or control line signaling – Substation originated
Patent

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Telephone apparatus and method adapted for use by impaired...

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

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Telephone apparatus and private branch exchange apparatus

Telephonic communications – Supervisory or control line signaling – Signal reception at substation
Patent

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Telephone apparatus for invalidating incoming call signals durin

Telephonic communications – Supervisory or control line signaling – Substation originated
Patent

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Telephone apparatus including circuit for producing dial data fr

Telephonic communications – Supervisory or control line signaling – Substation originated
Patent

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Telephone apparatus with conditional operation

Telephonic communications – Supervisory or control line signaling – Substation originated
Patent

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Telephone apparatus with hearing assistance

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

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Telephone automatic redial system

Telephonic communications – Supervisory or control line signaling – Substation originated
Patent

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Telephone call alert device with selectable alert modes

Telephonic communications – Supervisory or control line signaling – Signal reception at substation
Patent

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Telephone call alerting system and information processing system

Telephonic communications – Supervisory or control line signaling – Signal reception at substation
Patent

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Telephone call indicator

Telephonic communications – Supervisory or control line signaling – Signal reception at substation
Patent

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Telephone call information delivery system

Telephonic communications – Supervisory or control line signaling – Signal reception at substation
Reexamination Certificate

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Telephone call information delivery system

Telephonic communications – Supervisory or control line signaling – Signal reception at substation
Reexamination Certificate

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Telephone calling card dialer

Telephonic communications – Supervisory or control line signaling – Substation originated
Patent

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Telephone card and telephone card-operated telephone

Telephonic communications – Supervisory or control line signaling – Substation originated
Patent

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Telephone case with easily reconfigured pushbutton keys

Telephonic communications – Supervisory or control line signaling – Substation originated
Patent

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Telephone device for preventing a long-term on-line state result

Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection
Patent

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Telephone device having customized ring capability

Telephonic communications – Supervisory or control line signaling – Signal reception at substation
Patent

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Telephone dialer card

Telephonic communications – Supervisory or control line signaling – Substation originated
Patent

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Telephone dialer having at least one speech synthesizer processo

Telephonic communications – Supervisory or control line signaling – Substation originated
Patent

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