The Thermionic Valve and Its Developments in Radiotelegraphy and Telephony by J. A. Fleming
1919. No Edition Stated. 279 pages. No dust jacket. Red cloth with gilt lettering. B&W illustrations throughout. Clean pages. Notable tanning to pages throughout. Some gutter cracking. Mild wear and bumping to spine, board edges and corners. Moderate tanning to spine, with scuffing and soiling to boards. Book has a forward lean.