| 摘要 |
1287748 Valves SHELL INTERNATIONALE RESEARCH MAATSCHAPPIJ NV 17 Feb 1970 [10 March 1969] 12382/69 Heading F2V [Also in Division G1] A relief valve operating just above atmospheric pressure, comprises a perforated steel tube, surrounded by a silicone rubber tube with longitudinal slits, Figs. 8A, 8B (not shown). |
