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 6685-01-202-7419
NSN 5935-01-392-5160
NSN 5930-01-428-3053
NSN 5990-01-043-3400
NSN 5920-01-168-7810
NSN 5910-00-111-4811
NSN 5930-01-583-0494
NSN 5920-01-441-8316
NSN 6135-01-633-8502
NSN 6150-01-616-4964
NSN 6320-00-139-1090
NSN 6150-01-634-0575