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 6685-01-391-6010
NSN 6620-00-089-9778
NSN 5835-01-068-4214
NSN 6650-01-503-5419
NSN 5930-01-094-4345
NSN 6610-00-596-9883
NSN 6650-01-534-2769
NSN 6320-01-624-0193
NSN 5910-00-110-0899
NSN 7035-01-135-0050
NSN 6110-01-378-6492
NSN 6685-00-924-4900