backup power supply
51Doctor V64 — A Bung Doctor V64 V64 fully installed The Doctor V64 (also referred to simply …
52Database — A database is an organized collection of data for one or more purposes, usually in digital form. The data are typically organized to model relevant aspects of reality (for example, the availability of rooms in hotels), in a way that supports… …
53Fuel cell — For other uses, see Fuel cell (disambiguation). Demonstration model of a direct methanol fuel cell. The actual fuel cell stack is the layered cube shape in the center of the image A fuel cell is a device that converts the chemical energy from a… …
54Disk enclosure — A 3.5 USB/FireWire hard disk enclosure A disk enclosure is essentially a specialized chassis designed to hold and power disk drives while providing a mechanism to allow them to communicate to one or more separate computers. Drive enclosures… …
55Space Shuttle Solid Rocket Booster — The Space Shuttle Solid Rocket Boosters (SRBs) are the pair of large solid rockets used by the Space Shuttle during the first two minutes of powered flight. They are located on either side of the orange external propellant tank. Each SRB produces …
56Massachusetts Water Resources Authority — The Massachusetts Water Resources Authority (MWRA) is a public authority in the Commonwealth of Massachusetts that provides wholesale drinking water and sewage services to certain municipalities and industrial users in the state, primarily in the …
57Hard disk drive — Hard drive redirects here. For other uses, see Hard drive (disambiguation). Hard disk drive Mechanical interior of a modern hard disk drive Date invented 24 December 1954 [1] …
58Diesel generator — A Cummins diesel generator of 500kVA in a tourist resort in Egypt …
59International Space Station — ISS redirects here. For other uses, see ISS (disambiguation). International Space Station …
60Data center — An operation engineer overseeing a Network Operations Control Room of a data center. A data center (or data centre or datacentre or datacenter) is a facility used to house computer systems and associated components, such as telecommunications and …
