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 6685-00-295-0824
NSN 6220-01-519-7822
NSN 6240-00-504-2531
NSN 6610-01-598-6052
NSN 5945-00-915-1120
NSN 2925-00-394-2332
NSN 6145-01-098-3899
NSN 5935-01-547-3703
NSN 5925-00-382-7701
NSN 5905-01-258-4921
NSN 5910-00-186-3191
NSN 5915-01-437-8671