Intermeshing-rotor helicopter (Synchropter)

Submitted by aua on
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https://en.wikipedia.org/wiki/Intermeshing_rotors
https://en.wikipedia.org/wiki/Category:Synchropters
https://en.wikipedia.org/wiki/Intermeshing-rotor_helicopter
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title (item) ID
Flettner Fl 282 Kolibri (Hummingbird) 99176
Kaman K-225 133389
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