DIN 4922-1
DIN 4922-1
Steel Filter Pipes for Drilled Wells with Slot Perforation and Fisching (Butt Strap Joint)standard by Deutsches Institut Fur Normung E.V. (German National Standard), 02/01/1978
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 02/01/1978