'War inventions that came too late', Harpers
Tags: 1910s; 1914-1918; 1919; 1919-11-1; Asphyxiating and poisonous; Balloon gases; Caterpillar tractors; Design and Invention; Drone aircraft; Engineering; Gases; Helium; Inventions; Stockbridge, Frank Parker; Technology; United States; War use; World War I
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