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 5920-00-594-3124
NSN 5990-01-630-5094
NSN 5935-00-137-1290
NSN 5990-01-189-3201
NSN 5920-00-199-9514
NSN 6645-00-099-6913
NSN 5985-01-641-0275
NSN 2925-01-391-1540
NSN 4140-00-483-1932
NSN 6105-00-113-9364
NSN 5975-01-506-0454
NSN 6220-01-040-1406