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 4140-00-259-2567
NSN 5910-01-112-4786
NSN 5996-01-444-7283
NSN 5945-00-131-0893
NSN 5855-00-939-4496
NSN 6645-01-046-2804
NSN 5985-00-529-0093
NSN 5945-00-175-7626
NSN 6620-01-492-8470
NSN 6620-00-286-5721
NSN 6105-01-384-3063
NSN 5895-01-211-6807