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 5985-01-427-9852
NSN 5930-01-327-4699
NSN 5910-01-391-5609
NSN 6320-01-380-7372
NSN 5990-01-136-4068
NSN 6610-00-814-8598
NSN 5835-00-140-8646
NSN 5960-01-239-4314
NSN 6650-00-824-5510
NSN 4140-01-254-3689
NSN 4140-01-144-0305
NSN 5945-01-313-6013