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 6685-01-012-1557
NSN 6685-01-524-5492
NSN 5930-01-353-0423
NSN 5996-01-535-6443
NSN 5998-01-580-0933
NSN 7035-00-585-2113
NSN 5990-01-106-3786
NSN 5990-00-995-6071
NSN 6150-01-154-0258
NSN 5960-00-402-9390
NSN 5960-01-197-4461
NSN 4140-01-056-3654