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Long before the gate at the top, the back end of the movable gate comprises a gate, the gate frame and is located at the top of the lifting lug and the vertical frame including each other is stuck on the front vertical frame and the vertical frame of the vertical frame and the vertical frame is arranged between an opening towards the gate of the long groove, groove of the rear side wall is provided with a rectangular groove and rectangular groove is provided with a side sealing strip and side rubber strip, rubber strip at the top of the rectangular groove at the bottom of the front surface side sealing strip after the end, side sealing strip on the front face of the top in the posterior surface of the outer gate surface and the outer edge of the groove of the front side wall is stuck, transverse frame front end face is provided with a rectangular groove and rectangular groove