A transparent item of a predetermined size that permits unobstructed and undistorted view of a desired area. It may include a frame, have reference markings, grid lines and may be heat strengthened and/or tinted. It is generally used where safety, security, and/or the restriction of foreign matter are required, such as the visual examination of the inside of pressurized tanks, liquid sights, controlled liquid flow, and inspection of equipment enclosed in a housing. See window (as modified); scale, cathode ray tube; scale, plotting; window, metal; window, wood; and window panel, aircraft.
Classification: Pressed or molded glass articles, wired or not, for building or construction;leaded glass windows etc; formed multicellular or foam glass
NSN 6620-01-448-1423
NSN 5930-01-178-2717
NSN 5999-00-759-1013
NSN 6620-00-816-9755
NSN 5945-01-496-6134
NSN 5930-01-617-2183
NSN 4140-00-925-4149
NSN 6220-01-441-1648
NSN 5905-01-175-5686
NSN 5915-00-753-7553
NSN 5905-00-708-0891
NSN 6620-01-307-3468