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 5910-00-959-5209
NSN 6105-00-539-0393
NSN 6320-00-036-3688
NSN 7035-01-339-5480
NSN 5895-01-536-3047
NSN 5999-01-386-7179
NSN 5996-01-074-7041
NSN 6650-00-255-8269
NSN 7035-01-114-3134
NSN 6645-01-459-2966
NSN 4140-00-276-9154
NSN 5945-01-325-7999