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EW—20型与EW—30型是日本西部电机工业制造的CNC方式的线切割机床。EW—20型系一九七二年制成并在第六届日本国际机床展览会上展出(参见图1),是世界上最早采用CNC方式的线切割机床。EW—30型于一九七四年第七届日本国际机床展览会展出(见图2)。
Model EW-20 and Model EW-30 are CNC-type wire-cutting machines manufactured by Western Electric Works of Japan. The EW-20 was made in 1972 and exhibited at the 6th Japan International Machine Tool Show (see Figure 1). It is the world’s first CNC cutting machine tool. The EW-30 was exhibited at the 7th Japan International Machine Tool Fair in 1974 (see Figure 2).