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 5915-01-433-2128
NSN 6685-01-330-7330
NSN 5990-01-529-7307
NSN 6110-01-484-2899
NSN 6610-01-614-9340
NSN 5920-01-359-1197
NSN 6320-01-029-2196
NSN 6685-01-310-7193
NSN 5990-01-020-6841
NSN 6110-01-167-1499
NSN 6150-01-463-7196
NSN