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Internally braced airplanes, French 315 Monoplane, French 325 Pursuit airplanes, Wibault, French 446 Thick wings, korane Saulnier, French 467 Interplane communication, French 319 Struts, lack of, Dornier, German 640 Interpretation, mathematical, French 316 Isle of Grain, England 720 - 736 Isetta engines, Italian 546 - 578 Issy des Moulineux,[?] wind tunnel at, French 413 Balance for 417 Diffuser of 415 Experimental chamber 415 Propeller for 415 Speed of 416 Standard 417 Italian aeronautical activities, resume of 505 Policy 508 Airplanes produced in 1921 506 Dirigibles 539 Engines 513 Equipment, storage of 584 Experimental Station 535 Flying bomb 538 Seaplane, Caproni 574 Type specifications 519 Italy, policy of 505 "Jaguar" engines, Siddeley, British 827 - 828 - 845 - 846 - 899 Jahiel, Ino M., agent for Pescura, French 504 James, British racing pilot 775 Japanese agents in Italy 514 Jets, carburetor, French 343 JL-6 airplanes, Junkers, German 654 Joints, petro flex tubing, British 873 Welded, Fokker, Dutch 694 Junkers Company, German 588 - 653 Activities of 653