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 6135-00-170-8819
NSN 6320-01-381-7023
NSN 4140-01-351-3892
NSN 5975-00-155-7065
NSN 6240-01-367-1925
NSN 5930-01-546-1919
NSN 6645-00-269-2764
NSN 6320-00-636-0922
NSN 5905-01-160-5385
NSN 5895-01-227-5213
NSN 6685-00-248-4016
NSN 6145-00-115-1845