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 6130-01-264-4626
NSN 5930-01-015-1300
NSN 5855-00-281-3843
NSN 5925-01-348-4223
NSN 5965-01-258-8735
NSN 5990-01-480-9938
NSN 6645-01-159-8787
NSN 5975-01-591-9798
NSN 6645-01-292-9778
NSN 6650-01-029-8705
NSN 6130-00-235-9970
NSN 6650-01-181-6037