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 5996-01-458-0821
NSN 5998-01-487-3620
NSN 6110-01-170-4190
NSN 6135-01-297-5565
NSN 7035-01-499-9239
NSN 6130-01-442-6491
NSN 5930-00-627-8978
NSN 5996-01-228-9306
NSN 5998-01-566-7672
NSN 6620-00-880-7728
NSN 6105-00-426-5430
NSN 6320-01-519-8767