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 6620-00-811-7614
NSN 6650-00-401-7896
NSN 5965-01-633-8849
NSN 6130-00-877-5743
NSN 6105-01-323-9506
NSN 5915-01-322-4512
NSN 6620-01-412-5514
NSN 5965-01-334-7456
NSN 5895-00-642-9587
NSN 5950-01-124-5516
NSN 6685-01-043-6378
NSN 6130-01-277-9050