Method and apparatus for expanding the capacity of a main distribution frame of a telephone exchange without increasing the main distribution frame.

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• 2. 具有主框架和至少一个副框架的屋顶窗、用于安装这种屋顶窗的方法及用于拆卸屋顶窗的副框架的方法 [P] . 中国专利： CN111417763A . 2020-07-14
• 3. Telephone line access system for main distribution frame. [P] . ES8702762A1 . 1986-11-16

  机译： 主配线架的电话线接入系统。

• 4. EXPANDING THE CAPACITY OF A MAIN DISTRIBUTION FRAME [P] . 世界知识产权组织专利： WO0021307A1 . 2000-04-13

  机译： 扩大主要分销框架的能力

• 5. Expanding the capacity of a main distribution frame [P] . AU6468499A . 2000-04-26

  机译： 扩展主配电架的容量

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