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Hi,

here is some personal helicopters and one flying belt concepts;

- Claesson -  Sweden

- Georges  - Germany

- Junker,Arnold  Canada

- Weihrauch - Germany

- Haustetter - France

- - Just - Germany

[URL unfurl="true"]https://apps.dtic.mil/dtic/tr/fulltext/u2/a045375.pdf[/URL]