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 6150-01-016-5289
NSN 5930-00-004-6395
NSN 6620-00-146-3465
NSN 5915-00-777-4296
NSN 4140-00-155-8012
NSN 4140-01-329-9523
NSN 6685-01-356-6918
NSN 6320-00-593-0379
NSN 5965-00-951-9961
NSN 6135-01-116-3385
NSN 6130-01-318-2543
NSN 6135-00-080-9176