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 6220-00-939-1429
NSN 5905-00-005-0298
NSN 6620-00-379-2856
NSN 5950-01-457-5365
NSN 5985-01-463-2527
NSN 5910-01-020-6433
NSN 5935-00-144-4395
NSN 4140-00-881-8739
NSN 5935-00-668-7903
NSN 6110-00-826-0394
NSN 6220-01-433-5281
NSN 5990-01-110-8979