The first units, called type A12117c, are produced in an adjacent department. Historically (แต่เดีม), these parts have been produced at a rate of 12 per hour, but the actual flow is not at all steady. (Because time is short, the adjacent department itself will not be modeled.) The proposal calls for these parts to have their own preparation area (หรือเรียกว่า “prep area”). At the prep area for A12117c, the mating faces of the cases will be machined to insure a good seal, and then deburred and cleaned. A factory worker who used to do this kind of job at another plant thinks it will take about 4 minutes per part, with a range of 1 to 8 minutes. The A12117c parts will then be transferred to the insertion/sealing/inspection operation.