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 5965-01-483-3356
NSN 6145-00-100-4358
NSN 4140-01-378-5190
NSN 6620-01-197-7665
NSN 6135-01-124-2376
NSN 5965-01-233-0771
NSN 5990-00-568-4940
NSN 5895-01-307-0556
NSN 5920-00-201-4914
NSN 6645-01-617-3354
NSN 6110-01-456-7913
NSN 6645-01-629-9657