William M. Clark, a retired businessman, generously provided a collection of engines, levers, pumps, axles, and crankshafts for us to display in boxlike frames.
一位退休的商人William M.Clark慷慨的为我们提供了一系列的引擎，撬杠，水泵，轴和机轴来帮助我们在盒子一样的框架里面展示。
ZPB Remote Button Box use of far distance control start, stop, emergency stop and shut off fans & oil pumps of various kinds of electrical equipment and display working state by indicator.
ZPB遥控按钮盒供远距离控制各种电器设备的启动、正转、反转、紧急停止及风油切断等用处，并通过指示显示工作状态。
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