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 5999-01-634-0576
NSN 5960-00-865-1730
NSN 5990-01-307-4489
NSN 6610-01-412-0058
NSN 4140-01-448-0733
NSN 5965-01-483-7244
NSN 5945-01-174-7950
NSN 5930-00-391-6323
NSN 6110-01-107-2690
NSN 6240-01-267-5490
NSN 6620-01-072-9372
NSN 5930-00-919-4543