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US2930434A
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Hatch operating device
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Packing for rotatable surfaces
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Combined propeller pitch and engine speed control device
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ES161893A1
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An apparatus for transmitting distance operating impulses
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Swivel joint
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Operating device for propellers, turbine wheels, and pump wheels having rotatable blades
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Ship propeller having rotatable blades
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US1510436A
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Hub for impellers with turnable vanes
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US1431221A
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Apparatus for operating the starting device of water turbines or the like
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