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 6610-01-361-4193
NSN 5998-01-055-4294
NSN 5895-00-042-1519
NSN 5910-00-088-0391
NSN 2925-00-265-7539
NSN 6130-01-139-3701
NSN 5930-01-552-4981
NSN 6650-01-159-3755
NSN 5975-01-502-6167
NSN 5950-00-985-5112
NSN 5945-00-952-5644
NSN 5965-00-207-6085