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#2 French soldiers with cylinders of hydrogen used to inflate observation balloons, 1915.

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French soldiers with cylinders of hydrogen used to inflate observation balloons, 1915.

Military Observation Balloons of WWI: Before Satellites And Drones, these Hot Air Balloons Were Used For Surveillance

#2 French soldiers with cylinders of hydrogen used to inflate observation balloons, 1915.

WWI

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