LEADER 00000nam 2200193 a 4500 001 0137227 003 UkHlHU 007 t 008 002310 0 1968 000 eng 040 UkHlHU 050 4 |fq|aHE 9144 P8 110 2 Post Office Engineering Union. 245 10 Notes on telephone development. 260 London :|bPost office Engineering Union,|c1968. 300 29p. 650 0 Telephone communications. 946 020 absent -- ISBN check required
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