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公开(公告)号：US2764951A
公开(公告)日：1956-10-02
申请号：US28443152
申请日：1952-04-25
Applicant: SPROUT WALDRON & COMPANY
Inventor： DONALD FISHER CHESTER
IPC: B30B11/20
CPC classification number: B30B11/201 , Y10S100/907 , Y10S425/23
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公开(公告)号：US2731248A
公开(公告)日：1956-01-17
申请号：US28443052
申请日：1952-04-25
Applicant: SPROUT WALDRON & COMPANY
Inventor： DONALD FISHER CHESTER
IPC: B01F7/24
CPC classification number: B01F7/243
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