Class 160/253 - Pulley or drum lift on roller

Subclass of Class 160 - Flexible or portable closure, partition, or panel
Definition: Roll type devices in which there is a pulley or drum mounted
No. of patents: 1
Last issue date: 05/28/1996

Number	Title	Issue Date
5520236	Greenhouse curtain system A novel greenhouse curtain system has a plurality of movable curtains oriented vertically one above the other to form a flexible wall. Each curtain is supported by a fixed upper edge, and the vertical position of the lower extent of each curtain may be ad...	05/28/1996

PatentStorm