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 5990-01-641-2217
NSN 5999-01-514-7439
NSN 5975-00-084-5264
NSN 5905-00-727-1799
NSN 5835-00-165-3069
NSN 6610-01-406-6696
NSN 5915-01-476-8178
NSN 5920-01-219-3469
NSN 5920-01-581-2736
NSN 6105-01-056-9800
NSN 2925-01-254-3068
NSN 5965-01-143-9577