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John Evans' Sons, Inc. is an international leader in custom spring design and custom manufacturing of constant force window balance springs, reels, elevator ...
egress spring  helical mount  torsion leaf spring  window balance spring 
www.springcompany.com - 2009-04-03
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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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vehicle lifts
super lift
doors
casement
hoist
sliding door
spiral balance
timber
door
windows
4x4
french door
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