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1.发明授权
公开(公告)号：US3151019A
公开(公告)日：1964-09-29
申请号：US19724962
申请日：1962-05-24
Applicant: STALEY MFG CO A E
Inventor： RUSSELL SHILDNECK PAUL , LEROY CUSHING MERCHANT
IPC: D21H17/28
CPC classification number: D21H17/28
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