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 5965-01-611-9700
NSN 5855-00-160-2286
NSN 5915-01-487-0421
NSN 6110-00-604-7753
NSN 6220-01-088-6604
NSN 5998-00-894-0904
NSN 5930-01-204-1691
NSN 6130-01-181-4039
NSN 6240-00-456-2578
NSN 5990-01-617-5156
NSN 5910-01-161-9307
NSN 5915-01-512-8851