pressurized reservoir
71Oil pump (internal combustion engine) — This article is about a part in an internal combustion engine. For other uses, see Oil pump. Oil circulation system …
72Pipe Organ — Principal instrument of many Christian traditions. How an instrument associated with outdoor political and secular festivals of ancient Rome became the sole instrument allowed inside Christian churches by the 13th century remains mysterious,… …
73Hydropower — Hydropower, hydraulic power or water power is power that is derived from the force or energy of moving water, which may be harnessed for useful purposes.Prior to the widespread availability of commercial electric power, hydropower was used for… …
74SR-71 Blackbird — infobox Aircraft name = SR 71 Blackbird caption =An SR 71B Trainer over the Sierra Nevada Mountains of California in 1994. Note second cockpit is raised for the instructor. type = Strategic Reconnaissance manufacturer = Lockheed Skunk Works… …
75Tennessee Valley Authority — Infobox Company company name = Tennessee Valley Authority company company type = Government owned independent corporation company slogan = foundation = 1933 founder = location = Knoxville, Tennessee, USA key people = Tom Kilgore (current CEO)… …
76Pumpjack — Nodding donkey redirects here. For the British Rail train, see Pacer (train). Pump jack redirects here. For the Scaffold, see Pump jack. A diagram of a pumpjack. A pumpjack (nodding donkey, pumping unit, horsehead pump, beam pump, sucker rod pump …
77Gas-filled tube — See also: Gas discharge lamp A gas filled tube, also known as a discharge tube, is an arrangement of electrodes in a gas within an insulating, temperature resistant envelope. Although the envelope is typically glass, power tubes often use… …
78NERF — NERF(or sometimes Nerf) is a type of toy, created for safe indoor play, that either shoots or is made of foam like material. Most of the toys are a variety of foam based weaponry, but there were also several different types of NERF toys, such as… …
79Space Pen — The Space Pen (also known as the Zero Gravity Pen), marketed by [http://www.fisherpen.com/ Fisher Space Pen Co.] , is a pen that uses pressurised ink cartridges and is claimed to write in zero gravity, upside down, underwater, over wet and greasy …
80DD tank — DD Sherman tank with its flotation screen lowered Service history In service 1944–1950s …
