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公开(公告)号：US2710012A
公开(公告)日：1955-06-07
申请号：US24853651
申请日：1951-09-27
Applicant: POWERS & COMPANY
Inventor： POWERS FRANK M , OSCARSON EDWIN T , GARECHT FREDERICK G
IPC: E04H15/28
CPC classification number: E04H15/28 , Y10S135/905
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