Mine Telephone

Mine Telephone

 

a mine rescue wired-communications device that provides direct two-way communication with loudspeakers between an underground base and a mine rescue squad.

The Sh–1 mine telephone, which is used in the USSR, consists of a base set and two squad sets. The squad sets may be held in the hand or fastened to the work outfit with a spring hook. Semiconductor devices and printed wiring are used in the electrical components of the telephone sets, which are designed to operate with general-purpose cable drums.

The Sh–1 mine telephone is designed for continuous operation at temperatures of 0° to 50°C, at relative humidities of up to 90 percent, and under conditions of exposure to coal dust, foul air, and underground water. The telephone has a communications range of 5 km and operates continuously for 100 hr without replacement of the power source. It is sparkless and, together with its carrying case, weighs 4.8 kg.

References in periodicals archive ?
Person name pradeep kumar designation chief manager (excv )i/c goc mine telephone number with std code 07172645928, 7774057820
Contact person name shri kant designation colliery engineer (enm), urdhan oc mine telephone number with std code 07167-258127
Manager (e&m)i/c goc mine telephone number with std code 7172645922
2) the safe load testing of 60t pinguly crane model no tl 786 mh 34 a 738 b hydraulic pressure testing of air tanks installed in hemm and testing of metal sheet and operational testing of safety valves attached to air tanks 26 nos (2nd call) person name pradeep kumar designation chief manager (excv )i/c goc mine telephone number with std code 07172645928, 7774057820
Tenders are invited for Cleaning, water washing of 05 nos dozers on daily basis & cleaning of w/s premises (dozer) at ghugus ocm (2nd call) person name pradeep kumar designation chief manager (excv )i/c goc mine telephone number with std code phone 07172645928, 7774057820