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Underground Mine Communications (In Four Parts). 1. Mine Telephone Systems (Including Articles on a Coaxial-cable Telephone System and Conventional Telephone Equipment).

Authors
Anonymous
Source
NTIS: PB 270 187 :61 pages
Link
NIOSHTIC No.
10001362
Abstract
This Bureau of Mines report is devoted to descriptions of systems that provide in-mine wired telephone service. Although they may incorporate other features, each system described functions to allow one telephone to selectively access another telephone. Except for the paper on conventional telephone equipment, the equipment described is newly developed and specifically designed to satisfy the requirements of underground mine communications.
Publication Date
19770101
Document Type
IH; Information Circular;
Fiscal Year
1977
NTIS Accession No.
PB-270187
NTIS Price
A05
Identifying No.
IC 8742
NIOSH Division
PRC;
Source Name
NTIS: PB 270 187
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