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 5905-00-168-1586
NSN 5990-01-251-2296
NSN 5950-00-837-3083
NSN 5960-01-167-8796
NSN 5960-01-093-4892
NSN 4140-01-088-0401
NSN 5920-01-546-8925
NSN 5915-01-274-5485
NSN 5910-01-078-4756
NSN 6685-00-927-2199
NSN 5998-01-071-2805
NSN 5960-01-512-0233