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 5895-01-230-0266
NSN 6620-01-127-6306
NSN 5905-01-346-9539
NSN 7035-01-413-6697
NSN 5835-01-115-4056
NSN 5975-00-256-3569
NSN 5920-00-962-8500
NSN 6320-00-725-0754
NSN 5915-00-738-2695
NSN 5999-01-234-2110
NSN 5985-01-493-2671
NSN 5930-01-463-8551