Patent search ap:("SPECIALTIES DEV CORP") AND inv:"SHEFFER JR RALPH L" Page 1

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发明授权
High pressure operated relief and check valve 失效
Title translation: 高压卸压和止回阀

公开(公告)号：US2804881A

公开(公告)日：1957-09-03

申请号：US41930854

申请日：1954-03-29

Applicant: SPECIALTIES DEV CORP

Inventor： BERNARD SEID , SHEFFER JR RALPH L

IPC: F16K15/18

CPC classification number: F16K15/18 , Y10T137/7771 , Y10T137/7834

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