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Consisting of a wooden double wheel with flat-bottomed grooves, 150 and 50 mm diameter respectively. The wheel is pivoted on a spindle 10 mm diameter which projects for a distance of 100 mm so that...
Consisting of a wooden double wheel with flat-bottomed grooves, 150 and 50 mm diameter respectively. The wheel is pivoted on a spindle 10 mm diameter which projects for a distance of 100 mm so that...