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 5895-00-529-7547
NSN 6685-01-020-8756
NSN 5910-01-566-3296
NSN 5910-01-500-6256
NSN 5920-01-094-7284
NSN 6650-00-205-6282
NSN 5915-01-204-9053
NSN 2925-00-720-3948
NSN 5999-01-215-7522
NSN 6220-01-429-8534
NSN 6620-01-583-2779
NSN 6650-01-569-5575