Never place your hands near a machine with rotating parts. Make use of push stick when pushing a timer across a circular blade.

Introducing a kind of dynamic capability study method which tested jumpiness of the sawblade made in Germany on the precision sizing saw machine, as well as vibration of principal rotation axle.

Conclusion in the treatment of cervical trauma and cervical disc herniation, the procedure of anterior decompression and fusion using ZDS trepan can be simpler, safer and more effective.