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 6650-01-323-6252
NSN 6320-01-421-3777
NSN 6610-00-982-6768
NSN 6110-01-068-3552
NSN 2925-00-056-7112
NSN 5910-00-359-8482
NSN 5925-01-362-9693
NSN 6220-01-251-0344
NSN 6685-01-539-4737
NSN 6145-00-319-4643
NSN 6150-01-173-2584
NSN 5905-00-822-4096