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 5950-01-438-3490
NSN 6620-01-600-7483
NSN 4140-01-442-5155
NSN 6145-00-803-2100
NSN 5960-01-287-4187
NSN 5920-01-281-7354
NSN 7035-01-434-0606
NSN 6240-01-449-0746
NSN 5855-01-023-3727
NSN 5945-01-512-3847
NSN 5950-01-261-0787
NSN 5930-01-120-2678