造船工业。海水专用阀门。带打开机构的螺杆向下止动和止回阀。式样。操作机构零件细目表。
Shipbuilding . sea water valves . screw - down stop - and - check valves with opening mechanism . pattern iv . operating mechanism parts list.
造船工业。海水专用阀门。带打开机构的螺杆向下止动和止回阀。式样。操作机构零件细目表。
Shipbuilding . sea water valves . screw - down stop - and - check valves with opening mechanism . pattern iv . operating mechanism parts list.
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