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公开(公告)号：US2570977A
公开(公告)日：1951-10-09
申请号：US1328648
申请日：1948-03-05
Applicant: PETROLITE CORP
Inventor： PETTEFER ROBERT L , BADGER JR GEORGE M
CPC classification number: G05D9/04 , B01D17/0214
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