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 5930-01-546-0247
NSN 5930-01-231-6568
NSN 5935-00-608-5357
NSN 2925-01-374-2402
NSN 5985-01-005-6958
NSN 6650-00-754-2276
NSN 6240-00-438-6999
NSN 6150-00-945-3368
NSN 7035-00-076-4097
NSN 5855-00-688-9954
NSN 6145-00-262-3345
NSN 6150-01-617-2888