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Balloons, observation, Italian 509 Batteries, storage, French 377-378 Bayerische Motor Works, German 660 Beam, sound reflector, British 734 Bearings for Condor engines, British 754 Beds for dirigibles, Italian 539 Belt, gunners' method of fastening, French 366 Berline transport airplanes, Spad, French 434 Berne deck flying, Hanriot, French 477 Bevel reduction gears, British 853 Biggin Hill, England 734 Bimotored airplanes, French 333 Biplace pursuit airplanes, French 316 Biplace pursuit and nigh reconnaissance airplanes, French 389 Armament for 390 Characteristics of 391 equipment for 390 Fuel for 390 Biplane wings, French 330 Blackburn Company, British 716 Blaisdell petro flex tubing, British 731-871 Blankets, heating of, ambulance planes, French 454 Bleriot commercial airplanes, French 427 Bleriot Spad Herbemong Company, French 423 Types, French 423 B. M. W. motors, Dutch 679 German 639-654 Conclusion, German 666-667 Difference of make, German 659 Failures of, German 662 Report on, German 658-667 Service results, German 660-666 Type, German 659 Boat bottoms, concave, Italian 543 Boats, flying, large, British 719 Savoia, Italian 542 "Bodensee", ex-German Zeppelin 630 Bolton and Paul, British 710-712-621