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Machine answer detection

Telephonic communications – Supervisory or control line signaling – Signal receiver
Patent

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Management of telephone call routing using a directory...

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

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Memory architecture for telephone dialer

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

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Memory device

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

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Memory dial telephone finder

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

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Memory dialing control system having improved telephone number r

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

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Merging various request methods into a single unified user...

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

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Message and ringing signaling device for a telephone installatio

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

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Message generator with auto dialer

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

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Method and apparatus enabling a calling telephone handset to...

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

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Method and apparatus for a dual mode keypad permitting one-touch

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

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Method and apparatus for abbreviated dialing in a subscriber...

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

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Method and apparatus for alphanumeric data entry

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

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Method and apparatus for an improved ring trip detection telepho

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

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Method and apparatus for an intelligent telephone prefix dialer

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

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Method and apparatus for analyzing dual tone multi-frequency...

Telephonic communications – Supervisory or control line signaling – Signal receiver
Reexamination Certificate

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Method and apparatus for automatic generation of telephone call

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

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Method and apparatus for automatic redialing of telephone number

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

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Method and apparatus for automatic telephone area-code dialing

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

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Method and apparatus for automatically initiating a...

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

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