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 7035-01-550-6737
NSN 5990-00-010-8186
NSN 5990-01-443-2931
NSN 6150-00-800-3652
NSN 5950-01-485-6178
NSN 6220-01-427-2333
NSN 5998-00-288-5533
NSN 4140-01-463-0172
NSN 6105-01-215-1174
NSN 4140-01-088-6981
NSN 5935-00-476-8080
NSN 6685-01-128-8026