schaltungsanordnung for a grand phone system

• 1. 驱动电路、包括驱动电路的电路布置及包括电路布置的逆变器 [P] . 中国专利： CN107258047B . 2020.06.23
• 2. 驱动电路、包括驱动电路的电路布置及包括电路布置的逆变器 [P] . 中国专利： CN107258047A . 2017-10-17
• 3. schaltungsanordnung for a grand fernmeldeamt, especially grand telephone exchange [P] . 德国专利： DE000001487839A . 1969-11-27

  机译： 大型电信办公室，尤其是大型电话交换机的电路布置

• 4. schaltungsanordnung for a grand phone system [P] . 德国专利： DE000001178472A . 1964-09-24

  机译： 大型电话系统的电路布置

• 5. schaltungsanordnung for a grand phone system [P] . 德国专利： DE000000923672B . 1955-03-07

  机译： 大型电话系统的电路布置

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