00620nam a2200217Ia 4500 CTU_83674 210402s9999 xx 000 0 und d 621.385 M645 Millman, S. A history of engineering and science in the bell system : Physical Sciences (1925-1980) S. Millman The United States of America AT&T Bell Laboratories 1983 Telephone History United States Qhieu(sửa) Trung tâm Học liệu Trường Đại học Cần Thơ