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 5998-01-360-5358
NSN 5855-00-327-2112
NSN 5930-01-010-2289
NSN 5835-00-133-0599
NSN 5996-01-366-6810
NSN 6645-01-581-5214
NSN 5855-00-014-5008
NSN 6135-00-497-0491
NSN 5855-00-147-2508
NSN 5935-00-627-1226
NSN 5930-01-168-7594
NSN 6620-01-591-6681