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Improvements in terminal intercommunication uni- versal
Improvements in terminal intercommunication uni- versal
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机译:终端互通通用性的提高
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摘要
A universal intercommunication terminal 1 comprises a telephone set, keys 15, signalling members 19, and connection members 20. The terminal is connected to a central unit by three pairs of lines comprising a conversation pair 3, 4, a control pair 16, 17, and a power supply pair 23, 24. IMAGE
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