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 5915-00-223-5308
NSN 4140-01-261-2966
NSN 5855-00-762-4833
NSN 5998-01-516-4363
NSN 5835-01-068-4214
NSN 6610-00-150-6408
NSN 5960-01-414-8918
NSN 6645-01-523-4164
NSN 6150-01-483-8036
NSN 5925-00-806-7493
NSN 6150-00-724-9669
NSN 5925-01-118-1203