faux black leather-covered binder with metal corner protectors, stamped to the spine 'TECHNICAL MANUAL B.B.C.' and to the front cover 'TECHNICAL MANUAL, M-E.M.I. SYSTEM of TELEVISION, LONDON TELEVISION STATION, THE BRITISH BROADCASTING CORPORATION', with label inside front cover which reads ' Copy 1412' with engineers signature, the book is designed to be updated with early pages removed and replaced with later pages, the earliest part of the book is chapter 1 dated October 1937, the latest part is an amendment sheet at the front dated 1950