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 6645-01-185-7684
NSN 6130-01-643-5672
NSN 5990-01-243-4233
NSN 5905-01-306-1159
NSN 6150-00-583-9878
NSN 6645-01-119-3496
NSN 5925-01-080-0741
NSN 6110-01-445-9351
NSN 5905-00-318-5653
NSN 5930-01-459-9527
NSN 6610-01-535-0310
NSN 5935-01-423-4559