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 5895-00-753-5349
NSN 6240-01-492-0581
NSN 5910-01-504-9086
NSN 6650-01-144-4672
NSN 6130-00-754-2950
NSN 5945-01-448-8888
NSN 5990-00-939-0461
NSN 6145-01-316-5357
NSN 5930-00-934-2843
NSN 5915-01-117-7804
NSN 6105-01-323-7679
NSN 6240-01-324-0323