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 6240-01-462-1874
NSN 5950-01-219-9193
NSN 5975-01-386-4457
NSN 6320-01-349-8077
NSN 5895-00-115-9236
NSN 5930-01-269-1036
NSN 5855-01-121-8862
NSN 6650-01-201-2956
NSN 5905-00-225-8632
NSN 6610-00-138-2942
NSN 6220-01-003-9126
NSN 6645-00-664-4665