Combination gate valve and ball launcher and catcher for use in pressure flow lines
作者： Donald F Cockrell , Stephen A Bergman
DOI:
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摘要:
lens.org 参考文章(3)
Le Roy C Jones, Carl E Jones, Device for inserting and projecting cleaning projectiles in air lines for converters ,(1948)
Cavenagh Frank, Revolving-disk valve ,(1922)
Reuben C Baker, Multiple plug feeding and ejecting conduit head ,(1952)