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 5999-00-069-2090
NSN 2925-01-567-8027
NSN 6135-01-426-8282
NSN 5985-01-472-2357
NSN 5855-01-491-0140
NSN 5935-01-458-7023
NSN 7035-00-703-3535
NSN 5930-00-493-3522
NSN 5915-00-488-3373
NSN 5960-01-026-2810
NSN 5965-00-378-3403
NSN 5950-01-495-7011