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of the framework, passenger rooms were insulated from the exterior by the dining area, and forced warm air could be circulated from the water that cooled the forward engines. The new design did prevent passengers from enjoying the views from the windows of their berths, which had been a major attraction on the Graf Zeppelin. On both the older and newer vessels, the external viewing windows were often open during flight. The flight altitude was so low that no pressurization of the cabins was necessary. The Hindenburg did maintain a pressurized

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