operational period
71Business and Industry Review — ▪ 1999 Introduction Overview Annual Average Rates of Growth of Manufacturing Output, 1980 97, Table Pattern of Output, 1994 97, Table Index Numbers of Production, Employment, and Productivity in Manufacturing Industries, Table (For Annual… …
72Organization of the Luftwaffe (1933–1945) — Luftwaffe …
73No. 41 Squadron RAF — Official Squadron Badge of No. 41 Squadron RAF Active 14 July 1916 Country …
74operations research — the analysis, usually involving mathematical treatment, of a process, problem, or operation to determine its purpose and effectiveness and to gain maximum efficiency. [1940 45, Amer.] * * * Application of scientific methods to management and… …
75Defence of the Reich — Part of Campaigns of World War II …
76North Yorkshire Moors Railway — Three LNER Class A4 locomotives at Grosmont loco shed. Locale North Yorkshire …
77Collins class submarine — HMAS Rankin, sixth submarine of the Collins class, underway in 2006 Class overview Builders: Australian Submarine Corporatio …
78History of radar — The history of radar starts with experiments by Heinrich Hertz in the late 19th century that showed that radio waves were reflected by metallic objects. This possibility was suggested in James Clerk Maxwell s seminal work on electromagnetism.… …
79Chernobyl disaster — This article is about the 1986 nuclear plant accident in Ukraine. For other uses, see Chernobyl (disambiguation). Chernobyl disaster …
80Artillery — For other uses of the term, see Artillery (disambiguation). Warfare Military history Eras Prehistoric Ancient …
