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From Air Pictorial 3/1958,
they mentioned that,in Bulgaria during 1958,a flight trails of the first prototype of helicopter
which must be indigenous design,during this period Mr. Boryslav Boniev did many helicopter
designs but remained a projects as I heard,has someone any idea about that ?.
they mentioned that,in Bulgaria during 1958,a flight trails of the first prototype of helicopter
which must be indigenous design,during this period Mr. Boryslav Boniev did many helicopter
designs but remained a projects as I heard,has someone any idea about that ?.