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 5960-01-515-4791
NSN 6110-01-478-4046
NSN 5835-00-779-2836
NSN 6135-00-628-1142
NSN 6685-00-970-9110
NSN 6620-01-378-5579
NSN 5925-01-372-0863
NSN 6150-00-635-7760
NSN 5950-00-938-7900
NSN 5945-01-381-2038
NSN 6685-01-035-5337
NSN 5855-00-361-0167