TY - BOOK ID - 6548411 TI - Telephony and telegraphy A : an introduction to instruments and exchanges (step-by-step and common control) PY - 1974 SN - 0198593449 0198593465 9780198593447 9780198593461 PB - London Oxford university DB - UniCat KW - #KVIV KW - 621.394 KW - Telegraphy KW - 621.394 Telegraphy UR - https://www.unicat.be/uniCat?func=search&query=sysid:6548411 AB - ER -