Title
American Sikorsky XB-4 helicopter
Caption
Sikorsky XB-4 prototype, the first mass-produced American helicopter, operational as of 1943
Date
20th century
Credit line
Photo12/Collection Bernard Crochet
Reference
CRO01264_030
Model release
No
License type
Rights managed
Available size
26,5Mb (1,3Mb) / 11,8in x 8,7in / 3543 x 2611 (300dpi)