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 5965-01-025-4677
NSN 6145-00-946-6950
NSN 6135-00-027-3914
NSN 6320-00-483-0451
NSN 5975-00-246-4906
NSN 6610-01-345-9040
NSN 6650-01-066-0420
NSN 6620-00-241-2165
NSN 4140-01-096-5722
NSN 5985-01-403-2835
NSN 5935-01-445-5643
NSN 7035-01-545-0834