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 6620-00-051-7666
NSN 5925-01-231-4362
NSN 2925-01-009-9560
NSN 6610-00-480-6633
NSN 5855-01-600-0486
NSN 5855-01-430-3246
NSN 5960-01-446-4446
NSN 6320-01-466-4175
NSN 6130-01-085-8853
NSN 6610-01-447-2560
NSN 6135-00-491-9864
NSN 6135-00-906-0984