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 5935-00-912-6906
NSN 2925-01-391-1540
NSN 5975-00-366-7440
NSN 5935-01-444-4943
NSN 6645-00-754-4108
NSN 6150-01-212-4344
NSN 6150-01-297-6975
NSN 6110-00-319-6825
NSN 6610-00-022-8628
NSN 6240-01-518-1595
NSN 5930-01-223-5157
NSN 4140-00-760-4498