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 5945-01-531-9861
NSN 5920-00-535-9398
NSN 2925-01-616-9370
NSN 5999-01-018-9346
NSN 5990-00-929-3216
NSN 5905-01-241-0201
NSN 6620-01-308-5723
NSN 5975-00-650-2608
NSN 6610-01-218-4188
NSN 6105-01-497-9897
NSN 6685-00-069-4987
NSN 5915-00-171-1812