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公开(公告)号:US2271493A
公开(公告)日:1942-01-27
申请号:US17024637
申请日:1937-10-21
Applicant: SHARPLES CORP
Inventor: NATHANIEL BREWER
IPC: B04B11/04
CPC classification number: B04B11/04
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公开(公告)号:US2234332A
公开(公告)日:1941-03-11
申请号:US29355139
申请日:1939-09-06
Applicant: SHARPLES CORP
Inventor: NATHANIEL BREWER
IPC: B04B11/08
CPC classification number: B04B11/08
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