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 6610-00-952-8832
NSN 5950-00-611-2601
NSN 5996-00-299-1609
NSN 5950-01-653-1264
NSN 6650-01-143-1116
NSN 6240-00-567-4795
NSN 6320-01-556-2011
NSN 5975-00-215-8571
NSN 6145-00-568-8030
NSN 5945-01-548-9249
NSN 5950-00-136-9657
NSN 5990-00-153-0055