Quote:
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The De los Olivos flying machine of 1904.
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Erm, no.
You are after
US Patent #542100.
It was also patented in the United Kingdom (1895 Patent no. 7271).
The balloon envelope, shown in the patent illustrations, is a bit misleading. The text for the flying machine patent makes it clear that the balloon is there only if the rotors are not sufficient in themselves to keep the machine aloft.
Paul