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Hi,
the Bolkow Bo-X was heavy-lift helicopter specifications of lifting payloads of approximately
20 tons,work on it was during the late of 50s and early of the 60s,it look like Bolkow Bo-70.
http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19930008694_1993008694.pdf
the Bolkow Bo-X was heavy-lift helicopter specifications of lifting payloads of approximately
20 tons,work on it was during the late of 50s and early of the 60s,it look like Bolkow Bo-70.
http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19930008694_1993008694.pdf
