Pipelines for mining; steel tubes with loose flanges and plain collars; nominal pressure 40
采矿管道；带松套法兰和平套的钢管；标称压力40

1989-11-01

Steel tubes for mining; fittings with loose flanges and plain collars; nominal pressure 40
采矿用钢管；带有松动法兰和平环的配件；标称压力40

1987-09-01

Steel tubes for mining; fittings with loose flanges and plain collars; nominal pressure 10
采矿用钢管；带有松动法兰和平环的配件；标称压力10

1987-09-01

Pipelines for mining; steel tubes with loose flanges and collars; projection and recess; nominal pressure 6
采矿管道；带松动法兰和套环的钢管；凸出和凹陷；标称压力6

1989-11-01

Steel tubes for mining; fittings with loose flanges and plain collars, projection and recess; nominal pressure 6
采矿用钢管；带有松动法兰和平环、凸出和凹口的配件；标称压力6

1987-09-01