FIELD: mining industry. SUBSTANCE: invention consists in provision of personal call with two-way communication and automatic warning of objects under control in case of emergency due to inclusion of party selection unit, group of OR gates, indicator of party number, memory unit, master light-emitting diode indicator, and band-pass filter unit. EFFECT: higher efficiency. 2 dwg
| Title | Year | Author | Number |
|---|---|---|---|
| AUTOMATIC TRANSMISSION SYSTEM OF SUPERVISORY INDICATION BY TELEPHONE LINES | 1992 |
|
RU2021539C1 |
| APPARATUS OF DISPATCHER CONTROL OF AIR DISTRIBUTION IN MINING WORKINGS AND CITY SEWAGE COLLECTORS | 1992 |
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| AUTOMATIC GAS PROTECTION TRAVELLING DEVICE | 1991 |
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| DEVICE FOR AUTOMATIC DISCHARGE AND CHARGE OF GROUP OF CELLS | 1992 |
|
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| DEVICE FOR TELECOMMUNICATION AND REMOTE CONTROL OF TECHNOLOGICAL EQUIPMENT | 0 |
|
SU1659678A1 |
| WARNING DEVICE | 0 |
|
SU1716172A1 |
| MULTICHANNEL DEVICE FOR REMOTE INDICATION OF EMERGENCY CONDITION OF EQUIPMENT | 0 |
|
SU1668704A1 |
| AUTOMATIC LINE FOR CHECKING AND ADJUSTING MINE GAS DETECTORS | 0 |
|
SU1723348A1 |
| DEVICE FOR TESTING GAS PROTECTION PICKUPS | 0 |
|
SU1689650A1 |
