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 6620-01-003-2905
NSN 6130-01-254-1548
NSN 5950-01-299-5945
NSN 5835-01-641-0073
NSN 6610-00-342-0699
NSN 5855-01-550-5219
NSN 5990-01-362-7532
NSN 6620-01-271-6192
NSN 5920-00-584-4592
NSN 6685-01-224-1925
NSN 5990-01-652-7373
NSN 6610-01-047-1299