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 6610-01-574-2429
NSN 6145-00-107-7913
NSN 5998-01-649-5754
NSN 5945-01-421-1808
NSN 5855-00-832-9341
NSN 5920-01-191-6321
NSN 6105-01-179-6152
NSN 6135-01-327-2092
NSN 5910-01-197-7358
NSN 5905-01-633-9570
NSN 5998-01-476-7582
NSN 6150-00-331-6351