C/W Watson
    C/W Robertson
Top Secret.   Copy No. 171                 38
Current Order No. 41 of Oct. 1943.
          Air patrolling of American waters is for the most part carried out by semi-rigid airships called "Blimps".  Length 74 m., 2 engines maximum speed 120 km., maximum range 3200 km., armament:  2.5 or 3.7 cm guns, bombs and depth charges.  They can carry on a cable, underwater detection gear.  
          In calm weather they can alight on the water.  



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