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 6645-01-246-2725
NSN 5905-01-528-7879
NSN 5835-01-310-8979
NSN 6150-01-485-1223
NSN 5960-01-602-6009
NSN 6145-00-971-8270
NSN 5935-01-530-3558
NSN 6110-00-406-4767
NSN 6620-01-364-7461
NSN 7035-01-200-4751
NSN 5895-01-307-7379
NSN 5925-00-940-8600