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 5935-01-370-3305
NSN 6645-00-248-5434
NSN 6220-01-629-2636
NSN 6320-01-072-2073
NSN 5975-00-061-7035
NSN 5975-00-051-5934
NSN 6320-00-036-3688
NSN 5835-00-133-9186
NSN 6145-00-479-0042
NSN 5925-01-500-5407
NSN 5910-01-633-9963
NSN 6150-01-406-3907