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 6220-01-540-3362
NSN 5950-00-188-7869
NSN 5855-00-548-4742
NSN 5925-01-549-0936
NSN 2925-00-174-4322
NSN 6145-00-398-4405
NSN 5990-01-263-9364
NSN 5855-00-198-3197
NSN 2925-01-054-3190
NSN 6130-00-567-2800
NSN 5960-00-957-0951
NSN 5975-01-630-2278