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 5895-01-070-1557
NSN 5930-00-112-6783
NSN 5985-00-315-1483
NSN 5998-01-213-2804
NSN 5910-01-227-5194
NSN 5835-01-123-7964
NSN 5935-00-275-7862
NSN 6135-01-010-0891
NSN 5855-00-939-4496
NSN 5990-01-281-0018
NSN 5905-01-480-2779
NSN 6620-00-233-6839