The present invention includes a cable having reduced surface friction and the method of manufacture thereof having steps in which a conductor wire is coated with a mixture of a plastic material and lubricating material and in which the coated conductor wire is cooled. The device comprises a sensor unit affixed to the wearer, an attachment element affixed to the wearer, an elastic cord extending between the sensor unit and the attachment element, and movement of the elastic cord due to incorrect posture actuating an indicating device. The method determines a delay statement for the output of the block model. A control valve assembly and a high pressure hydraulic fluid accumulator provide for rapid extension of the actuators to produce a rapid downward cutting action of the cutting blades. A method of monitoring a thin film deposition on a substrate also is described.