SHAO Guo-qiang. Model KTH1 Automatic Telephone with Amplifying[J]. Journal of Mine Automation, 1996, 22(2): 11-14.
Citation: SHAO Guo-qiang. Model KTH1 Automatic Telephone with Amplifying[J]. Journal of Mine Automation, 1996, 22(2): 11-14.
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Model KTH1 Automatic Telephone with Amplifying

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  • This paper described a telephone which has automatic telephone functions and special functions like ringing amplifying, speech broadcasting and so on.
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