Patent US 8995674
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| Patent number | US 8995674 |
|---|---|
| Title | Multiple superimposed audio frequency test system and sound chamber with attenuated echo properties |
| Inventors | George Frye |
| Company | Frye Electronics Inc |
| Filing date | 2012-05-30 |
| Grant date | 2015-03-31 |
| Cites |