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 6650-01-289-0524
NSN 6145-00-153-2818
NSN 5915-01-281-8559
NSN 6135-00-321-6707
NSN 5835-00-143-4153
NSN 5835-01-218-5560
NSN 5910-00-996-9559
NSN 6145-01-027-2055
NSN 7035-01-232-7263
NSN 5930-01-553-3229
NSN 5855-00-631-4565
NSN 5920-01-556-7297