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 5905-00-065-6843
NSN 5998-01-282-4056
NSN 5895-01-258-1787
NSN 5855-01-631-5051
NSN 6645-00-472-4048
NSN 4140-00-076-4088
NSN 6650-01-438-7323
NSN 5895-00-274-6255
NSN 5945-01-385-5234
NSN 5925-01-463-0305
NSN 5960-01-269-5704
NSN 6685-01-326-7020