Memoria: Patens form nº 3. Patents and designs acts 1907 and 1919. Nº 29.175 dated 19-11-1925. Complete specification. » Improvements in or relating to aircraft with rotative wings»
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Memoria: Patens form nº 3. Patents and designs acts 1907 and 1919. Nº 29.175 dated 19-11-1925. Complete specification. » Improvements in or relating to aircraft with rotative wings»
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