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Barrage balloon manufacture. Reinforcing the fins of a fish-of-the-air. These workers at the barrage balloon division, are putting double reinforcements on the right fin of a completed barrage balloon before it is deflated and sent to army training camps Every seam must be absolutely gas- and air-tight, since the tiniest pinhole would permit valuable amounts of precious helium to escape. General Tire and Rubber Company, Akron, Ohio

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