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 5999-01-556-3363
NSN 6130-01-557-1261
NSN 5999-01-214-4205
NSN 5999-00-302-4857
NSN 6650-00-510-3786
NSN 6645-01-313-9634
NSN 6650-00-434-0188
NSN 5965-00-408-5501
NSN 6610-00-833-5498
NSN 5915-01-532-8108
NSN 5925-01-321-2451
NSN 6135-00-295-2614