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 6135-01-097-9317
NSN 5998-01-620-0418
NSN 5930-01-584-6302
NSN 2925-01-168-6253
NSN 6110-00-518-2998
NSN 5996-00-281-4500
NSN 6105-01-068-4366
NSN 6610-00-300-4774
NSN 5835-01-386-4027
NSN 5945-00-500-5171
NSN 5996-00-441-6996
NSN 6220-00-774-5347