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 6620-00-877-3266
NSN 6320-00-238-9973
NSN 5960-01-424-1781
NSN 6130-01-443-3703
NSN 2925-01-121-3355
NSN 5930-01-130-7838
NSN 5905-00-253-3461
NSN 6145-00-826-9574
NSN 5950-01-649-8194
NSN 6145-00-253-9445
NSN 6220-01-424-4340
NSN 5895-01-246-3665