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 5920-00-953-5037
NSN 5985-00-957-5226
NSN 5960-01-397-8328
NSN 6105-00-288-5872
NSN 5935-01-553-5290
NSN 5990-01-008-2515
NSN 5965-01-129-1968
NSN 6645-00-107-2148
NSN 6130-01-481-3888
NSN 6610-01-065-1073
NSN 5999-00-216-7431
NSN 6110-01-433-2214