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 6685-01-383-6522
NSN 5910-01-600-8747
NSN 6620-00-189-0967
NSN 6220-00-215-6358
NSN 5985-01-599-8027
NSN 6610-01-365-7796
NSN 6110-01-392-3067
NSN 5835-00-814-1359
NSN 5985-01-226-6388
NSN 6150-01-384-2405
NSN 5990-01-321-2997
NSN 5975-01-632-4148