manual gas shut-off valve
41Europe, history of — Introduction history of European peoples and cultures from prehistoric times to the present. Europe is a more ambiguous term than most geographic expressions. Its etymology is doubtful, as is the physical extent of the area it designates.… …
42Fukushima Daiichi Nuclear Power Plant — Not to be confused with Fukushima Daini Nuclear Power Plant. See also: Fukushima Daiichi nuclear disaster Fukushima Daiichi Nuclear Power Plant The Fukushima Daiichi NPP in 2002 …
43Vacuum pump — A vacuum pump is a device that removes gas molecules from a sealed volume in order to leave behind a partial vacuum. The vacuum pump was invented in 1650 by Otto von Guericke. Types Pumps can be broadly categorized according to three… …
44Tang Dynasty — For the band, see Tang Dynasty (band). Tang 唐 ← …
45Opel Astra — Not to be confused with Chevrolet Astro. See also: Holden Astra and Vauxhall Astra Opel Astra Manufacturer Opel …
46Thermal power station — Republika Power Plant, a thermal power station in Pernik, Bulgaria …
47Steyr AUG — Infobox Weapon name=AUG caption=Steyr AUG A1 with convert|508|mm|in|1|sp=us|abbr=on barrel origin=flag|Austria type=Assault rifle is ranged=yes service=1978–present used by=See Users wars=East Timor, Afghanistan, Iraq designer=Horst Wesp, Karl… …
48Cabin pressurization — is the active pumping of compressed air into an aircraft cabin when flying at altitude to maintain a safe and comfortable environment for crew and passengers in the low outside atmospheric pressure.Pressurization is essential over 3,000 m (10,000 …
49Mercury-Redstone 4 — Mission insignia Mission statistics Mission name Mercury Redstone 4 Spacecraft name Liberty Bell 7 Spacecraft mass 1,286 …
50Apollo 8 — Infobox Space mission mission name = Apollo 8 insignia = Apollo 8 patch.png command module = CM 103 mass 28,817 kg service module = SM 103 lunar module = Lunar Test Article (LTA B) mass 9,026 kg booster = Saturn V SA 503 crew size = 3 launch pad …
