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 5925-00-070-5011
NSN 5975-01-071-4521
NSN 6150-01-538-0069
NSN 2925-01-269-3861
NSN 5905-01-082-0123
NSN 5905-00-995-0217
NSN 5960-01-218-2858
NSN 6620-01-112-6440
NSN 5905-01-313-8428
NSN 6610-01-284-6968
NSN 5895-00-244-0943
NSN 5990-00-862-3271