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 6135-01-210-8715
NSN 5985-00-571-3945
NSN 6320-00-164-4087
NSN 6130-01-557-7128
NSN 5985-01-225-1369
NSN 5915-00-432-7656
NSN 6145-01-041-6562
NSN 6645-00-758-4567
NSN 5960-00-488-4798
NSN 5960-00-361-8409
NSN 5950-00-387-0585
NSN 6645-00-914-2820