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 6130-01-460-5114
NSN 5855-01-592-3128
NSN 5920-01-433-8060
NSN 5835-01-126-9358
NSN 6220-00-242-0456
NSN 5998-00-803-3067
NSN 5895-01-067-7957
NSN 5960-00-382-6012
NSN 5996-01-563-1124
NSN 5999-00-889-9125
NSN 6110-00-492-1167
NSN 6135-00-050-7189