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 6240-01-411-3619
NSN 5855-01-018-1247
NSN 5855-01-020-7982
NSN 6320-01-631-7828
NSN 2925-01-043-9786
NSN 6650-01-090-0719
NSN 5990-01-142-0538
NSN 5998-01-098-7432
NSN 7035-01-462-2953
NSN 5835-00-427-2772
NSN 5915-01-614-3033
NSN 6130-01-150-5389