Ball valve having adjustable seat unit
作者： John W Cauffman
DOI:
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摘要:
lens.org 参考文章(4)
Mikeska Peter Lawrence, Seat for rotary plug valve ,(1945)
Alfred Anderson, Hose or pipe nozzle. ,(1900)
Howes John Edward, Spencer William Edward, Lift Valves and Seats therefor. ,(1910)
Edward W Sibley, Shut off valve ,(1933)