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 6105-01-112-9976
NSN 5950-01-411-6219
NSN 5905-00-243-2147
NSN 5965-01-559-5958
NSN 5905-01-127-0006
NSN 5985-01-423-1057
NSN 5965-01-523-5998
NSN 7035-00-535-8109
NSN 5998-00-840-5463
NSN 6110-01-193-1238
NSN 6620-01-100-2530
NSN 5990-00-583-9577