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 6130-01-033-1329
NSN 5895-01-311-1362
NSN 6130-01-476-8097
NSN 6130-01-562-7272
NSN 6105-01-482-6301
NSN 5999-00-443-5829
NSN 6685-01-573-8401
NSN 5990-00-834-8446
NSN 5905-00-171-2652
NSN 5998-01-304-7120
NSN 6130-01-205-8119
NSN 4140-01-503-8293