Apparatus electrical switch with multiple contacts enabling the use of the perforated paper used on existing pianos electrical, pneumatic and other machines

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• 2. 使用可逆线圈框架的电气开关设备附件子组件、附件及电气开关设备 [P] . 中国专利： CN101399139A . 2009-04-01
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  机译： 用于制造多部分电触点或开关元件的方法和设备

• 4. Method and apparatus for producing multiple-part electrical contacts or switching elements [P] . 欧洲知识产权局专利： EP0890398A1 . 1999-01-13

  机译： 用于制造多部分电触点或开关元件的方法和设备

• 5. SYNCHRONOUSLY OPERABLE ELECTRICAL CURRENT SWITCHING APPARATUS HAVING MULTIPLE CIRCUIT SWITCHING CAPABILITY AND/OR REDUCED CONTACT RESISTANCE [P] . 英国专利： GB2169138B . 1988-09-21

  机译： 具有多个电路切换能力和/或降低的接触电阻的可同步操作的电流开关装置

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