Inside Out Library · Explore

The "Universal propeller": built by Paragon Engineers, Inc., Baltimore, Md (1922)

NASA Technical Reports Server (NTRS) · leaf 7

An illustration from The "Universal propeller": built by Paragon Engineers, Inc., Baltimore, Md, 1922, leaf 7

NASA Technical Reports Server (NTRS)

Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.

More pictures from The "Universal propeller": built by Paragon Engineers, Inc., Baltimore, Md

More like this