Patent for Improvements in and relating to sound-transmission, sound-recording and sound-reproducing systems (Q38982)
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patent for stereo concept and sterio (record) recording
- GB394325A
| Language | Label | Description | Also known as |
|---|---|---|---|
| English | Patent for Improvements in and relating to sound-transmission, sound-recording and sound-reproducing systems | patent for stereo concept and sterio (record) recording |
|
Statements
14 June 1933
0 references