Invention Grant
- Patent Title: Diaphragm
- Patent Title (中): 隔膜
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Application No.: US16653117Application Date: 1917-05-05
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Publication No.: US1334435APublication Date: 1920-03-23
- Inventor: BUTOW PAUL E
- Applicant: BUTOW PAUL E
- Assignee: Paul E Butow
- Current Assignee: Paul E Butow
- Priority: US16653117 1917-05-05
- Main IPC: H04R7/00
- IPC: H04R7/00
Public/Granted literature
- US11128357B2 Automatically select codebook Public/Granted day:2021-09-21
Information query
