(duplicated) notes
51Alpine regiments of the Roman army — Roman infantry helmet (Imperial Gallic type). Late 1st century Th …
52Steam engine — A steam engine is a heat engine that performs mechanical work using steam as its working fluid. [ [http://www.britannica.com/EBchecked/topic/564472/steam engine steam engine Britannica Online Encyclopedia ] ] Steam engines have a long history,… …
53Zilog Z80 — One of the first Z80 microprocessors manufactured; the date stamp is from June 1976. Produced 1976 Common manufacturer(s) Zilog …
54IPsec — Internet Protocol Security (IPsec) is a suite of protocols for securing Internet Protocol (IP) communications by authenticating and/or encrypting each in a data stream. IPsec also includes protocols for cryptographic key establishment.… …
55Commodore 128 — Release date 1985 Discontinued 1989 Operating system Commodore BASIC 7.0 Digital Research CP/M 3.0 …
56Cassette deck — A cassette deck is a type of tape recorder for playing or recording audio compact cassettes. A deck was formerly distinguished from a recorder as being part of a stereo component system, while a recorder had a self contained power amplifier (and… …
57Motion control photography — is a technique used in still and motion photography that enables precise control of, and optionally also allows repetition of, camera movements. It can be used to facilitate special effects photography. The process can involve filming several… …
58Alizarin — Madder lake redirects here. For the Australian band, see Madder Lake (band). Alizarin …
59Eastern Suburbs & Illawarra railway line, Sydney — Public transport infrastructure in Sydney logo= name=Eastern Suburbs Illawarra Line transport mode=Commuter rail line line owner=CityRail operation area=Hurstville, Kogarah, Marrickville, Rockdale, Sutherland, Sydney map colour=Azure Blue… …
60Chicago and North Western Railway — Infobox SG rail railroad name=Chicago and North Western Railway logo filename=Chicago and North Western Railway Logo.svg logo size=175 marks=CNW, CNWS, CNWZ locale=Illinois, Iowa, Kansas, Michigan, Minnesota, Missouri, Nebraska, North Dakota,… …
