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 6145-00-834-6378
NSN 6135-01-026-9960
NSN 5905-01-528-7879
NSN 6650-01-029-7409
NSN 5960-00-156-5603
NSN 5999-00-926-3241
NSN 6685-00-888-8227
NSN 7035-01-271-1643
NSN 5985-01-523-6382
NSN 5935-01-650-4214
NSN 5920-01-068-3135
NSN 5855-01-163-8152