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Show This Is the Latest Type of Helicopter The "Maiden Milwaukee," all-metal monoplane which has been purchased from the Hamilton Metalplane company com-pany of Milwaukee by the Johnson Aeroplane company of Delray, Fla. Jesse C. Johnson has converted the plane into an experimental helicopter by providing horizontal 18-foot propellers for each wing, in addition to the front prop. The wing props are driven by shafts from a motor in the fuselage and are expected to cause the plane to rise and land almost vertically. |