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 6110-01-111-2614
NSN 5960-00-677-3354
NSN 5855-01-631-8430
NSN 5920-01-343-0294
NSN 6110-00-502-2391
NSN 6240-01-055-5193
NSN 5930-01-391-7775
NSN 5975-01-432-1292
NSN 6650-01-332-7080
NSN 5960-00-573-8985
NSN 7035-00-991-6877
NSN 6620-01-415-5803