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|---|---|
| has gloss | eng: Hugh S. Knowles (Hynes Iowa Sept. 23, 1904 - April 22, 1988) was an American acoustical engineer, inventor, and manufacturer in the hearing aids field. He was the holder of more than 50 patents in acoustics and related fields. |
| lexicalization | eng: Hugh S. Knowles |
| instance of | e/Acoustical engineering |
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