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公开(公告)号：US3470329A
公开(公告)日：1969-09-30
申请号：US3470329D
申请日：1966-02-09
Applicant: BLOCK ENGINEERING
Inventor： YOUNG NIELS O
CPC classification number: H04R23/008
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公开(公告)号：US3398949A
公开(公告)日：1968-08-27
申请号：US64455667
申请日：1967-06-08
Applicant: BLOCK ENGINEERING
Inventor： YOUNG NIELS O
IPC: A63H33/40
CPC classification number: A63H33/40
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