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 7035-01-034-6183
NSN 6105-00-437-6759
NSN 5965-01-587-2366
NSN 5925-00-993-4603
NSN 5915-00-944-2731
NSN 6130-01-324-1253
NSN 5905-01-054-2409
NSN 5855-01-255-1688
NSN 5999-01-432-2147
NSN 4140-01-175-0919
NSN 2925-00-644-0028
NSN 5925-01-591-2032