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 5935-01-099-0017
NSN 4140-01-388-9377
NSN 5855-01-359-5727
NSN 5985-01-161-3112
NSN 5990-01-369-6915
NSN 5998-01-436-8363
NSN 5910-01-170-0540
NSN 6145-00-753-2264
NSN 5930-01-116-4239
NSN 5910-01-556-4278
NSN 6105-01-112-0490
NSN 5960-01-586-5235