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 4140-00-200-0970
NSN 2925-01-622-8568
NSN 6685-01-126-3061
NSN 6150-00-627-2081
NSN 5835-01-380-5086
NSN 5895-01-393-7485
NSN 2925-01-209-9245
NSN 5835-01-257-0154
NSN 4140-00-253-1801
NSN 6650-01-381-2972
NSN 5920-01-421-0291
NSN 5950-00-465-6936