Aiming at the doffing system with fixed length and weight was added in DTY machines, and applied it to the polyester filament production.

External cutters are generally used to remove the topmost, possibly damaged, portion of a fish to enable an overshot, or similar fishing tools, to engage on an undamaged surface.

A landing gear drop test method is presented in this paper, in which the lift is simulated by an air actuator and accumulator system with constant pressure.