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 5905-01-444-0016
NSN 6645-00-536-1555
NSN 5915-01-023-5936
NSN 6645-01-122-9430
NSN 5835-01-462-5983
NSN 7035-01-113-6492
NSN 5895-00-132-6847
NSN 6150-00-518-2743
NSN 6130-01-386-6715
NSN 6220-01-227-5214
NSN 6220-01-435-4839
NSN 5960-01-467-0961