001: 2488
003: Starlibrary PMS 4.5
005: 20180420
020: ^a0-7506-9944-2
066: ^aSt.U
072: ^aThe Convertional Telephone Set
082: ^a621
100: ^aStephen J. Bigclow
240: ^aUnderstanding telephone electronics
245: ^aUnderstanding telephone electronics
260: ^c1991
650: ^a The Telephone System