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 5925-01-188-7630
NSN 6110-01-104-1375
NSN 5990-01-357-6175
NSN 5999-01-535-3083
NSN 5998-01-437-4642
NSN 5960-00-321-0627
NSN 6110-00-079-7874
NSN 5905-01-421-4421
NSN 6135-00-078-9931
NSN 6645-01-549-8910
NSN 6150-00-554-4576
NSN 5985-01-595-2616