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 6645-01-590-6385
NSN 6145-01-421-1533
NSN 6650-01-207-0829
NSN 5905-00-949-1290
NSN 5965-01-188-7267
NSN 5998-00-161-8608
NSN 5920-01-003-8110
NSN 5895-01-126-4357
NSN 5990-00-101-0065
NSN 6150-01-063-7874
NSN 5835-01-424-0054
NSN 6685-01-519-9250