前言1972年国民标准公司(National Stand-ard Co.)在苏格兰珀斯(Perth)建立起了一座静液挤压厂。当时世界上共有四个这类工厂,另三个分别在瑞典、荷兰、日本。国民标准公司当初的意图是生产拉伸用的包铜的铝棒坯,用于拉制线材,主要用它们代替室内全铜线或全铝线。此外公司还打算开发包铜的电工铝杆。 Preface 1972 National Stand-ard Co. established a hydrostatic extrusion plant in Perth, Scotland. There were four such factories in the world at that time, and the other three were in Sweden, the Netherlands and Japan. Originally intended by National Standards Corp., aluminum rod billets for drawing were used to draw wires, mainly replacing them with all-copper or all-aluminum wire in the room. In addition the company also intends to develop copper clad aluminum electric pole.