GOST 21756-1976 Printing teletypes for 5-elements code Reliability test methods《5单元编码的通断式印字电报机 可靠性试验方法》.pdf

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GOST 21137-1981 Apparatus telegraph start-stop 5-element code Methods of electric parameters measuring《5单元编码的通断式印字电报机 电参数测量方法》.pdf

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