Telephonic communications – Private or single line system – Doorbell system
Patent
1993-09-03
1996-04-02
Chin, Stephen
Telephonic communications
Private or single line system
Doorbell system
379 60, 455 332, H04M 160, H04M 1100
Patent
active
055048099
ABSTRACT:
A communication system for use in a mine to provide two-way communication between a conveyance which moves in a mine and a communication network located in the mine. The system comprising: means for producing a signal indicative of the location of the conveyance in the mine; a plurality of repeaters situated in the mine and being coupled to the communication network; and a controller for controlling the repeaters and the controller being responsive to the signal and having means for activating the repeater which is proximate to the conveyance so that a communication link is provided between the conveyance and the communication network.
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Chalmers Frank
Millions Robert
Chin Stephen
Kim Kevin
Placer Dome Inc.
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