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 5910-00-300-4988
NSN 5960-00-825-6442
NSN 5935-01-645-5649
NSN 5895-01-644-4765
NSN 6620-00-707-4195
NSN 2925-01-351-9748
NSN 5925-00-558-4242
NSN 6610-00-805-0021
NSN 6130-01-486-4321
NSN 6610-01-426-5090
NSN 5950-00-278-1201
NSN 6620-01-431-9176