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 5975-00-161-7998
NSN 5975-01-485-7961
NSN 5985-00-590-1752
NSN 6610-01-657-1773
NSN 5905-00-650-0367
NSN 5998-00-508-1863
NSN 5925-00-752-4110
NSN 2925-01-448-2880
NSN 6645-01-294-6403
NSN 5950-01-480-0507
NSN 5910-01-128-2942
NSN 5925-01-406-5626