the utility model relates to an automatic opening and closing device of a bus door. the utility model particularly relates to an automatic sliding device of the bus door.
本实用新型涉及一种客车车门的自动启闭装置,特别是一种客车车门自动滑移装置。
the urethra dilatation catheter comprises an epitheca and a hole closing device arranged in the epitheca, and is characterized in that the cross section of the epitheca is c-shaped hollow sleeve.
该尿道扩张导尿器,包括外鞘和置于外鞘内的闭孔器,其特征在于:所述的外鞘横截面呈c形的空心套管。
meanwhile, compared with the prior art, the opening and closing device has simple structure, flexible and reliable operation and low cost and is helpful for being widely applied.