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Telecommunication systems --- Telephone systems --- Design and construction --- 621.395.3 --- 621.395 --- -Telephone systems --- -Telephony --- Communication systems --- Communications systems --- Systems, Communication --- Electronic systems --- Telecommunication --- Public telephone systems --- Telephony --- Design and construction. --- -Public telephone systems --- 621.395 Telephony --- 621.395.3 Public telephone systems --- -621.395 Telephony --- Telecommunication systems - Design and construction --- Telephone systems - Design and construction