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 6220-00-900-4439
NSN 6620-00-708-3323
NSN 5910-00-733-8021
NSN 7035-01-238-5036
NSN 6105-01-520-6202
NSN 5945-00-191-0407
NSN 5998-00-761-8201
NSN 5915-01-222-0879
NSN 5945-00-515-2667
NSN 6645-01-646-2953
NSN 5975-00-553-7151
NSN 5905-00-289-9898