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Figure 1: Endo Roll™. (a) The device consists of an outer cylinder and an inner cylinder for hoisting, and both cylinders have slits to allow the film to be sandwiched between them. (b) How to store, insert the film into the slits of the inner and outer cylinders, rotate the inner cylinder for winding and store it in the outer cylinder

Figure 1: Endo Roll™. (a) The device consists of an outer cylinder and an inner cylinder for hoisting, and both cylinders have slits to allow the film to be sandwiched between them. (b) How to store, insert the film into the slits of the inner and outer cylinders, rotate the inner cylinder for winding and store it in the outer cylinder