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 5945-00-852-6558
NSN 5945-01-068-3503
NSN 5855-00-427-7848
NSN 6620-01-157-9267
NSN 5905-01-181-2699
NSN 6610-01-406-6696
NSN 6110-01-624-1428
NSN 5925-00-206-3580
NSN 6620-01-397-8683
NSN 5935-01-050-7487
NSN 5996-00-281-4500
NSN 5950-00-495-5214