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 5998-01-071-1278
NSN 4140-01-197-0406
NSN 5998-00-489-1254
NSN 6610-01-255-4544
NSN 5855-01-100-3272
NSN 6645-00-943-9063
NSN 5920-01-413-8513
NSN 6145-00-512-6675
NSN 6240-00-110-9414
NSN 2925-01-464-3093
NSN 6240-00-501-7964
NSN 5920-01-153-2690