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4

the French were formerly occupied by the Germans, and hangars of semi-permanent and permanent construction are found.
We can very well take a lesson from the experiences of the Allies as to methods of hangar and door construction, heating and lighting. Door suspension and handling are vital to the life of a hangar and it is essential that they be capable of being op-ened and closed easily and quickly to permit ingress and egress of machines under all weather conditions with the use of a minimum number of men.

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