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 5945-00-200-2311
NSN 5835-01-584-8538
NSN 5950-01-330-6995
NSN 6130-01-235-2824
NSN 5915-01-566-3494
NSN 6610-00-834-0713
NSN 5935-00-211-1026
NSN 6110-01-398-0212
NSN 6105-01-449-1046
NSN 5950-00-246-6362
NSN 5905-00-293-8294
NSN 5975-00-889-5118