4. Telephonic communications
  5. Supervisory or control line signaling
  6. Signal reception at substation

William C. Hamer

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System and method for transmitting data

Telecommunications – Wireless distribution system
Reexamination Certificate

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System and method for transmitting data

Telecommunications – Wireless distribution system
Reexamination Certificate

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System and method for transmitting data

Telecommunications – Wireless distribution system
Patent

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Telephone announcement system

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

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