Popular Mechanics, v. 71, n. 6, 1939

Google Books

1939-06

Public Domain (Google digitized)

Is Part Of
Title	Alternate label	Class
Gas Mask for Small Child Provides Airtight Seal
Swift Attack Bombers Race for Job in Army Air Corps
Model Waved on End of Stick Is Target for Aerial Gunner
Floats of Flying Boat Retract into Wing Tips
Wires Halt Aircraft Landing on Ship's Deck
Giant Floating Hangar Carries Sixty Planes
Two-Way Radio for Signal Corps Carried on Soldier's Back