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 5925-00-227-8557
NSN 5960-01-265-0354
NSN 5915-01-633-9845
NSN 5920-00-471-1440
NSN 5960-00-003-0904
NSN 5855-01-301-0158
NSN 5835-01-416-6455
NSN 2925-01-290-8208
NSN 6150-01-560-1291
NSN 6240-00-287-1988
NSN 5975-01-034-2963
NSN 6150-01-045-9241