Invention Grant
US08011413B2 Retractable screen door housing handle balancing system 有权
伸缩式门外壳手柄平衡系统

Retractable screen door housing handle balancing system
Abstract:
A horizontally extending screen door system having balancing cords that pull in a direction that opposes the force on a handle by the screen exerted by the wind up mechanism of the screen.
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