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 5925-01-338-4997
NSN 6110-00-477-4558
NSN 5835-00-447-1924
NSN 5975-00-899-1995
NSN 6645-01-627-6629
NSN 5835-00-233-6327
NSN 6240-00-566-8371
NSN 5835-01-357-9235
NSN 6130-00-896-3267
NSN 5905-01-485-0234
NSN 5935-01-312-8752
NSN 6130-01-453-1078