VSM 18640.4-1969 Pipes, seamless steel pipes made of pipe power St 351) St 35.41) and St 35.81), complying with the quality requirements for dimensions and applications
1969VSM 18640.4-1969 Pipes, seamless steel pipes made of pipe power St 351) St 35.41) and St 35.81), complying with the quality requirements for dimensions and applications