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Show 1"l l ' ' ' ' Door Operator Is Great Convenience for Garage The Scientific American illustrates and describes a door operator, the Invention In-vention of L. L. Shockley of Columbia. Mo., as follows: The invention provides a device es pecially adapted for barn and garage doors, wherein means is provided for counterbalancing the door, to perron it to be moved vertically with a min- Qj Door Operator. !mum of effort. With the drhanger. there are no rollers or track for rollers roll-ers to jump from, and the door CiU.no, stick as may the rolling door, bu.ee the door is counterbalanced it move without effort. |