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 6150-01-049-2354
NSN 6650-01-270-4512
NSN 5930-01-248-8442
NSN 5996-01-620-7742
NSN 7035-00-408-8170
NSN 5910-01-653-5125
NSN 6650-01-007-1890
NSN 6220-01-555-4748
NSN 4140-01-516-2939
NSN 6240-00-957-5724
NSN 5835-01-141-8823
NSN 5975-00-376-9451