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 5915-00-159-1403
NSN 6610-01-085-0804
NSN 7035-01-421-4446
NSN 5965-00-983-1815
NSN 6650-01-474-8972
NSN 5855-01-134-7106
NSN 5930-00-025-6295
NSN 5950-01-406-5992
NSN 5855-00-586-6255
NSN 6135-01-196-7399
NSN 6220-01-455-8942
NSN 5950-01-383-6545