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 5999-01-010-4242
NSN 6145-01-437-5505
NSN 6645-01-435-6373
NSN 6110-01-519-9131
NSN 2925-01-653-0629
NSN 6150-01-443-6221
NSN 6650-01-057-5438
NSN 6135-00-935-5241
NSN 6320-00-160-0899
NSN 5910-01-069-5237
NSN 5905-00-269-5452
NSN 6150-00-909-7339