• In 1979, Beijing institute of electrical carbon dioxide laser is developed, and the kilowatt in early 1980s respectively applied in cylinder and stamp printing equipments of laser treatment.

    1979年,北京市机电研讨研制胜利千瓦二氧化碳激光器80年月初别离应用于汽缸套邮票印刷设备激光处置

    youdao

  • In 1979, Beijing institute of electrical carbon dioxide laser is developed, and the kilowatt in early 1980s respectively applied in cylinder and stamp printing equipments of laser treatment.

    1979年,北京市机电研讨研制胜利千瓦二氧化碳激光器80年月初别离应用于汽缸套邮票印刷设备激光处置

    youdao

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