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公开(公告)号：US3508312A
公开(公告)日：1970-04-28
申请号：US3508312D
申请日：1968-01-15
Applicant: FREDERICK A BURNE , VALYI EMERY I
Inventor： BURNE FREDERICK A , VALYI EMERY I
CPC classification number: F28F13/003 , B23P15/26 , F28F2275/14 , Y10T29/49377 , Y10T29/49378 , Y10T29/49904
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