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 2925-00-288-1394
NSN 6620-01-412-0938
NSN 5990-01-370-7912
NSN 6650-01-437-8852
NSN 5996-00-141-3945
NSN 5920-01-079-1210
NSN 5855-01-477-0550
NSN 6645-00-796-7206
NSN 5975-00-729-1651
NSN 5855-01-138-4985
NSN 5990-01-044-4767
NSN 5998-01-234-7838