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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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block & tackle
door
awning
window hardware
architectural hardware
garage
glass
hardware
tools
computer
doors
double hung
constant force
door hardware
extension spring
software
window parts
casement
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