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1.发明授权Method and apparatus for resonating small piezoelectric crystals at low frequencies 失效在低频下共振小压电晶体的方法和装置
公开(公告)号：US3433462A
公开(公告)日：1969-03-18
申请号：US3433462D
申请日：1968-01-19
Applicant: CREST ULTRASONICS CORP
Inventor： COOK EDWARD G
CPC classification number: B06B1/0276 , B06B1/0648 , B06B2201/20 , B06B2201/71
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