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 6645-01-064-3711
NSN 6240-01-027-7533
NSN 6110-01-370-4984
NSN 6610-01-487-6843
NSN 5950-01-032-4178
NSN 7035-01-100-5973
NSN 5985-01-150-4273
NSN 4140-01-634-0330
NSN 6110-01-165-0499
NSN 5960-01-007-5838
NSN 6130-00-985-7899
NSN 6645-01-388-0391