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 6130-00-802-6482
NSN 6150-01-512-1952
NSN 6145-01-100-4921
NSN 5960-01-116-6100
NSN 6685-01-212-3972
NSN 6150-00-374-9318
NSN 6685-00-890-8410
NSN 6650-01-449-1409
NSN 6220-00-227-0528
NSN 5925-01-212-0118
NSN 5945-00-146-8576
NSN 6150-00-221-2593