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 5925-01-412-8210
NSN 6110-01-011-0795
NSN 6320-01-583-6809
NSN 4140-01-020-6026
NSN 6645-01-589-0983
NSN 5965-01-083-5278
NSN 5930-01-345-0556
NSN 7035-01-518-4418
NSN 6620-00-900-3986
NSN 6145-01-529-6566
NSN 6320-01-304-3639
NSN 6620-01-449-3101