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Unique Balance, the original inventor of the spiral balance system in 1932, produces a product line including Block and Tackle, Constant Force, Pivot Shoes, ...
Lite Lift  Pivot Bar  Screen Corners  Tilt for Jamb 
www.unique-balance.com - 2009-02-12
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astragal
door weatherstrip
extension spring
door knobs
door hardware
extension springs
doors
block and tackle
glass
hardware
door
door bottom
block & tackle
coil spring
garage
cabinet hardware
compression spring
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