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откидная заслонка клапана (Часть сигнального воздушного клапана сухотрубной системы пожаротушения: Starting from the initial gas (air or nitrogen) pressure required to set the valve clapper, observe the duration required to return the system pressure to its normal setting.  fire-sys.ru coopernord) | |||
| valve clapper: 19 phrases in 9 subjects |
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