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 6240-00-959-4952
NSN 5910-00-477-5216
NSN 5915-01-500-2147
NSN 6135-00-203-9645
NSN 6650-01-433-0837
NSN 5925-01-627-5810
NSN 6220-01-565-2245
NSN 4140-01-422-4431
NSN 5835-00-987-9341
NSN 6110-01-297-0963
NSN 5910-00-817-5888
NSN 6685-01-584-5590