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1.发明授权Ultrasonic method and apparatus for investigating the interior structure of solid bodies 失效用于调查固体内部结构的超声波方法和装置
公开(公告)号：US3023611A
公开(公告)日：1962-03-06
申请号：US57258756
申请日：1956-03-19
Applicant: HOWRY DOUGLASS H
Inventor： HOWRY DOUGLASS H
IPC: G01N29/06
CPC classification number: G01N29/06
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公开(公告)号：US2778002A
公开(公告)日：1957-01-15
申请号：US47044454
申请日：1954-11-22
Applicant: HOWRY DOUGLASS H
Inventor： HOWRY DOUGLASS H
IPC: B06B1/02
CPC classification number: B06B1/0215 , B06B2201/30
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