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 5835-01-295-2431
NSN 5835-00-834-1286
NSN 5835-01-550-5094
NSN 6685-01-443-4207
NSN 5950-00-234-0532
NSN 6650-01-517-7867
NSN 6685-00-155-4301
NSN 6135-01-498-2233
NSN 5855-00-821-7512
NSN 5855-00-631-4565
NSN 6105-01-027-0685
NSN 6220-01-417-3330