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 5990-01-400-3299
NSN 5935-01-332-9361
NSN 5925-01-632-5546
NSN 6150-01-511-0262
NSN 6610-00-587-3260
NSN 6685-01-123-9275
NSN 5935-01-068-4488
NSN 5965-01-089-8579
NSN 5935-01-069-3002
NSN 5910-01-129-9311
NSN 5985-00-264-5504
NSN 6110-00-923-0975