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 6145-01-202-7769
NSN 5905-01-480-0130
NSN 5935-01-097-9481
NSN 4140-01-542-9504
NSN 5999-00-587-0167
NSN 5920-01-114-1841
NSN 6620-01-047-5831
NSN 7035-01-327-6130
NSN 5925-01-520-8900
NSN 4140-01-605-7911
NSN 5985-00-786-1569
NSN 6620-01-407-1158