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The United States Patent and Trademark Office» Source «Prev «1 ... 26 27 28 29 30 31 32 33 34 ... 36» Next» Richard Moore - US Patent 2761517 Sept 4, 1956 Control Mechanism for Propellers of the Contra-rotation Type
» Source «Prev «1 ... 26 27 28 29 30 31 32 33 34 ... 36» Next» |
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