Helicopter progress

Title: Helicopter progress
Subject: en Imagined technology & prototypes; en Airplanes and Zeppelins
Article Title and/or Image Caption: Helicopter progress - Present orders and future possibilities point toward a fertile field for rotating wing aircraft
Contributor: Alexander Klemin (author)
Language: eng
Temporal Coverage: World War II
Date Issued: 1943-07-01
Is Part Of: Scientific American, v. 169, n. 1, 1943
pages: 40
Rights: Public domain
References: Sikorsky
Archived by: Stefano Furi