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 5998-01-395-5178
NSN 6240-00-076-2752
NSN 5895-01-022-7496
NSN 5965-01-329-7890
NSN 5999-01-595-5142
NSN 5935-00-440-2673
NSN 6220-01-237-2488
NSN 6135-01-633-8502
NSN 5965-00-761-4666
NSN 5945-01-103-6509
NSN 5950-00-543-2376
NSN 5930-01-461-3414