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 2925-01-437-1128
NSN 5935-01-217-5113
NSN 6610-01-148-1860
NSN 5998-01-476-4123
NSN 6135-00-262-6807
NSN 4140-01-237-5799
NSN 6650-00-276-9838
NSN 5935-00-196-5093
NSN 5945-00-139-4392
NSN 5910-00-064-7706
NSN 6240-00-248-6517
NSN 5895-01-578-4910