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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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door
block and tackle
insulating
garage
kite-mark
block & tackle
compression spring
skylights
natural light
roofing
glass
skylight
extension spring
hermeticaly sealed units
extension springs
coil spring
doors
kite mark
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