Homocentric-square-shaped track for garage door
The utility model discloses a track shaped like a Chinese character'hui 'for a garage door, which comprises a first U-shaped track, the surface of the first U-shaped track is fixedly connected with a second U-shaped track, the surface of the second U-shaped track is fixedly connected with...
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Format: | Patent |
Sprache: | chi ; eng |
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