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 5998-01-533-3070
NSN 5910-01-067-8361
NSN 5915-01-441-6612
NSN 5835-00-341-5441
NSN 5990-01-512-9129
NSN 5998-00-308-1048
NSN 5975-01-232-9319
NSN 6685-00-100-4753
NSN 5965-01-563-6977
NSN 5998-01-369-6877
NSN 5855-01-503-1495
NSN 5965-01-517-8198