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 6110-00-245-5975
NSN 5950-01-416-4387
NSN 5835-01-502-9228
NSN 6150-00-964-7303
NSN 6105-01-398-6063
NSN 6145-00-275-4046
NSN 5945-01-512-1533
NSN 5895-00-498-8615
NSN 6650-01-610-0010
NSN 7035-01-029-7221
NSN 5990-01-044-1271
NSN 6150-01-523-3977