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 5905-00-707-7733
NSN 5855-01-406-4821
NSN 5905-01-121-0318
NSN 5990-00-229-4647
NSN 5960-00-761-5762
NSN 5895-01-634-0630
NSN 6135-01-584-0941
NSN 5945-00-118-1103
NSN 4140-00-918-5562
NSN 4140-00-983-4083
NSN 5835-01-492-4318
NSN 5985-01-229-1780