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 5915-01-570-3148
NSN 6645-00-912-0248
NSN 2925-00-572-0454
NSN 5945-00-290-1779
NSN 6650-01-412-1040
NSN 5985-01-274-5268
NSN 6320-01-429-5728
NSN 5965-01-419-6624
NSN 5935-00-633-8302
NSN 6105-00-541-8472
NSN 6145-00-929-9406
NSN 6135-01-377-5729