U. S. PATENT 951,942. being distributed under them. with a c orrespond- ing rarefac ion a jove them. No des cription of steermg me ans se ems to be g ven m he patent. U. S. Patent 95 ,316. J arch 15, 1910. T. Etrich and F, We s. In this de vice these well-kno^ vn Austi lan invent- ors propose to di…
Aeronautics
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