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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
doors
block and tackle
awning
glass
compression spring
computer
extension springs
door hardware
architectural hardware
hardware
block & tackle
double hung
extension spring
casement
coil spring
software
garage
tools
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