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 5965-00-464-6191
NSN 6320-01-551-3553
NSN 5835-00-461-9984
NSN 6135-01-408-0313
NSN 5935-01-354-6755
NSN 6610-00-012-8072
NSN 5985-01-035-5245
NSN 6145-01-446-3779
NSN 5895-00-631-3254
NSN 6650-00-292-9106
NSN 6645-01-622-6161
NSN 5905-00-908-4278