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 5920-01-440-0186
NSN 6685-00-485-1965
NSN 5915-01-622-7200
NSN 5950-00-290-8090
NSN 5920-01-100-3018
NSN 4140-01-339-2829
NSN 6685-01-189-8225
NSN 5990-01-328-2385
NSN 5925-01-132-9120
NSN 7035-01-079-1514
NSN 6645-01-408-4576
NSN 5920-01-290-3771