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Hangars, dirigibles, at Orly, French 493 Doors for, French 492 Zepplin 495 General remarks on 496 Heating of, French 493-494 Le Bourget, French 492 Lighting of, French 493 Night bombardment airplanes, French 407 Stoves for, French 494 Zepplin 495 Hanriot aircraft, French 329-476 Italian 507 Airplane 14 bis, French 479 Training, French 477 Types 476 Dual control mechanism, French 480 Dual mechanism, French 478 Metal construction, French 480 Twin float training airplanes, French 479 Harpoon hook device for deck flying, British 722 "Hawk" airplanes, "Mars II", Gloucestershire, British 779 Haw propellers, German 589 Hasards, fire, British 731 Head resistance, French 331-353 Heating, airplane, French 495 Heating apparatus, French 391-393-401-408 Arrangements, French 389 Blankets, ambulance airplanes, French 454 Hangars, French 493-494 Installation, French 406 Passengers' cabin, commercial airplanes, Bristol, British 790 Heat retaining jar, Aladdin, British 818 Treatment, duralumin, French 483 Heavy airplanes, French 333 Engines, oil, British 724 Helicoplane, Pescara, French 502-503 Helicopter, Brennan, British 723 British 723