Communications system

Details Communications system Communications system

2006-05-09

2006-05-09

Tran, CongVan (Department: 2688)

Telecommunications

Carrier wave repeater or relay system

Portable or mobile repeater

C455S009000, C455S039000, C455S040000

Reexamination Certificate

active

07043195

ABSTRACT:
A communications system, including at least one base station (8) at the surface, at least one repeater station (6) below the surface, and at least one mobile station (4) below the surface, the stations (4, 6, 8) establishing a bidirectional communications path between the mobile station (4) and the base station (8).

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