1990 - Volume #14, Issue #4, Page #8
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Lift-Up Door
A pair of troublesome sliding doors on a machine shed owned by Roland Ulstad, Madison, Minn., were replaced by a 24-ft. wide, 14-ft. high hydraulically-operated "lift-up" door that raises straight out and up, parallel to the ground.
Ulstad used a 3-phase, 2 hp electric motor to drive a hydraulic pump that powers ..........


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1990 - Volume #14, Issue #4