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 5996-00-840-5246
NSN 5990-01-658-9964
NSN 5930-00-702-2060
NSN 6645-00-292-5053
NSN 6610-00-149-1320
NSN 5910-00-104-5953
NSN 5920-01-334-9848
NSN 5945-01-459-0163
NSN 5895-01-403-2793
NSN 5975-00-203-8416
NSN 6650-01-330-6740
NSN 5998-01-287-6586