The 70 s became a decade of segmentation and line extension.

70年代是市场区分和产品线外延的年代.

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They designed the line extension with extra features and state - ofthe - art engineering.

于是他们设计了具备附加性能和先进工程学的线状延展.

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Never than less , it also enters into vacuum interrupter industry by product line extension.

甚至通过产品扩展,进入到了真空开关管行业.

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