London: Benn Brothers Limited 1921-1924. First Edition. Vol. 1: 282 pages. Vol 2: 227 pages. Vol 3: 339 pages. Three volumes complete. 4to. An exlibrary set (properly de-accessioned) nicely rebound in faux leather cloth binding with gilt spine lettering and inset on front panels. Original cloth title, author, and volume numbers laid down (Volume III label partly faded). Occasional library stamp or notation internally, otherwise a clean tight set. Includes the often missing pocket of diagrams inside rear cover. A sound working or reference set. Very Good. Cloth. 
A "Very detailed survey of British and other practice, including many large folding diagrams." (Sterling and Shiers, 7-044 starred entry for an item thought to be especially important)
Volume 1: Circuits and Apparatus as Used in the Public Services. Includes chapters on the Strowger, Siemens, Western Electric, and other systems.
Volume 2: Auxiliary Services and Private Branch Exchanges, Includes a brief supplement to Vol 1.
Volume 3: Large Multi-office Automatic Systems; Semi-Automatic Working; Miscellaneous Systems; Layout and Wiring' Power Plant; Traffic.
Highly technical, useful reference for the historian, collector, or restoration specialist. Many photographs and diagrams.
Sterling & Shiers, "A History of Telecommunications Technology," Maryland and London: Scarecrow Press, 2000.