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United States
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Helio Aircraft Company
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|---|---|
| ID | 356 |
| Title | |
| First Name | Otto C. |
| Last Name | Koppen |
| # of related pictures | |
| Country |
United States
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| Born | 1901 |
| Died | 1991 |
| Sex | male |
| Info (external) | https://en.wikipedia.org/wiki/Otto_C._Koppen |
| Related company |
Helio Aircraft Company
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| # of related collections | |
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