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 5915-01-553-2327
NSN 5835-01-611-8912
NSN 5910-01-480-3729
NSN 5945-00-106-0805
NSN 6610-00-471-4260
NSN 7035-01-521-8607
NSN 5975-00-079-9028
NSN 5935-00-063-3237
NSN 6220-00-069-5239
NSN 5965-00-144-2543
NSN 5965-00-529-0602
NSN 6105-01-579-6672