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公开(公告)号：US970066A
公开(公告)日：1910-09-13
申请号：US1908439306
申请日：1908-06-19
Applicant: CRACRAFT LEICH ELECTRIC CO
Inventor： LEICH OSCAR M , PEDERSEN NIELS
CPC classification number: H04R21/021
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公开(公告)号：US956377A
公开(公告)日：1910-04-26
申请号：US1908439307
申请日：1908-06-19
Applicant: CRACRAFT LEICH ELECTRIC CO
Inventor： LEICH OSCAR M , PEDERSEN NIELS
CPC classification number: H04M1/08
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