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 5975-01-203-8020
NSN 5975-01-468-5776
NSN 6685-01-240-4648
NSN 5945-01-259-4735
NSN 2925-00-087-2465
NSN 5855-01-465-9791
NSN 6130-00-616-8863
NSN 5920-00-121-5824
NSN 5925-01-385-7855
NSN 5910-01-235-6475
NSN 5950-01-124-0852
NSN 5965-01-217-7167