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 5920-01-622-3548
NSN 5996-00-308-0994
NSN 5945-00-784-3784
NSN 6620-01-456-0529
NSN 6150-01-446-3499
NSN 5960-01-007-2225
NSN 5835-00-055-0953
NSN 5990-00-404-2451
NSN 5895-01-449-2804
NSN 5895-00-862-5564
NSN 5960-00-172-7889
NSN 5835-01-442-6482