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 5998-00-980-4386
NSN 6320-01-643-0850
NSN 6645-01-440-5500
NSN 5996-00-276-5480
NSN 6645-00-421-5287
NSN 6685-01-173-3994
NSN 5895-01-527-0123
NSN 6220-00-776-2614
NSN 5935-00-235-3118
NSN 6685-01-518-0325
NSN 4140-00-773-3291
NSN 7035-00-275-5604