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 6110-01-381-1269
NSN 4140-01-460-4697
NSN 5950-01-268-1813
NSN 6145-01-325-9927
NSN 5920-00-661-0840
NSN 6320-01-183-8196
NSN 6150-01-327-8087
NSN 6685-01-147-0960
NSN 6110-01-155-6302
NSN 6105-01-422-1835
NSN 5855-01-364-1005
NSN 5905-01-154-2579