Apparatus for rotating a driven shaft in the same direction at two different speeds upon rotation of a drive shaft in respective, opposed directions. The apparatus includes a sun gear on the drive shaft, a ring gear on the driven shaft, a planet carrier rotatably mounted on the drive shaft, adjacent to the sun gear, one or more planetary gears rotatably mounted on the planet carrier and in mesh with the sun and ring gears. An over-running clutch locks the planet carrier to the drive shaft when the latter rotates in one direction to thereby lock the planetary gears to the sun and ring gears to cause rotation of the ring gear and the driven shaft in a first direction at a first speed. A sprag prevents rotation of the planet carrier relative to a fixed support when the drive shaft rotates in the opposite direction to thereby allow rotation of the planetary gears about fixed axes to rotate the ring gear and thereby the driven shaft in the first direction at a second speed.
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