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公开(公告)号：US1809221A
公开(公告)日：1931-06-09
申请号：US73912824
申请日：1924-09-22
Applicant: DIAMOND POWER SPECIALITY
Inventor： SNOW NORMAN L , HIRSHFELD CLARENCE F
IPC: F28G3/16
CPC classification number: F28G3/166
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