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 5920-01-271-2304
NSN 5990-01-189-9338
NSN 6650-01-520-4469
NSN 6150-00-516-8445
NSN 5920-01-619-7759
NSN 6105-01-056-5258
NSN 5996-01-143-9609
NSN 7035-01-528-7870
NSN 5835-01-599-1876
NSN 5996-00-827-2094
NSN 5950-01-089-8893
NSN 4140-01-359-7829