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 5960-00-984-4537
NSN 6650-01-199-0570
NSN 6685-01-015-9332
NSN 6135-00-816-9052
NSN 5905-00-965-9687
NSN 6620-01-585-7903
NSN 7035-01-429-0431
NSN 6135-01-265-1384
NSN 6320-01-145-9013
NSN 5998-00-212-4406
NSN 5935-00-419-3841
NSN 5835-01-257-0154