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| Picture No | 10116750 |
| Date | 1921 |
| Description | PETROCSY HELICOPTER |
| Details |
Austrian lieutenant Stefan Petrocsy proposes a remarkable helicopter design in which the cockpit is above the rotating blades : note, too, the balls serving as undercarriage.
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| Source | Cover by an unnamed artist for 'Science et Vie', July 1921 |
| Credit | Mary Evans Picture Library |
| Restrictions |
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