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公开(公告)号：US3478690A
公开(公告)日：1969-11-18
申请号：US3478690D
申请日：1967-12-28
Applicant: KOEHLER DAYTON
Inventor： HELKE ROBERT C , STURGEON WAYNE E
CPC classification number: F04D3/00 , F04D29/648 , F04D29/708
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