Mechanisms for change management of interfaces in a distributed computer system are provided in which there are multiple versions of an interface describing communication between distributed client and server applications. The welding wire passes between the pinch rollers whereby the pinch rollers engage the wire with a gripping force and incrementally rotate to control the outflow of the wire to the welding operation. This method determines the number of pixels associated with printout of the composition pattern in consideration of enlargement of the dot when printed. The incident surface is formed on one end in a longitudinal direction, faces the light emitting surface of the LED that emits white light, and receives incident light that is emitted from the light emitting surface. An alternate material sampling an analyzing assembly comprises a material sampling device comprising a discharge chute and a material analyzer assembly comprising a sample container and a material analyzer. An anchor member such as a threaded insert is coupled to the bottom surface of the unit member directly below each of the through-holes by fasteners such as bolts that pass through the through-holes.