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 7035-00-868-2640
NSN 6620-01-605-1465
NSN 5930-00-552-1946
NSN 2925-01-633-4048
NSN 6130-00-270-8063
NSN 6645-01-513-3071
NSN 6145-00-534-1412
NSN 7035-00-529-3128
NSN 2925-01-324-6423
NSN 5975-00-838-9322
NSN 5910-01-479-0182
NSN 5855-01-348-4623