73166576
Apr 17, 1978
May 26, 1981
Control Units for Distributing the Flow of Fluid into a Well Under the Action of a Suction Pump Over the Entire Surface Area of the Well Screens, and Parts of the Aforesaid Goods
Electrical and Scientific ApparatusPipes, Tubes, Conduits, Fittings, and Joint Units for Wells and for the Transmission of Fluid from Wells, Well Filters, Sandscreens for Wells, and Parts of the Aforesaid Goods
Environmental Control Apparatus