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 6320-00-433-2773
NSN 6220-00-635-8818
NSN 5930-01-377-9263
NSN 5925-00-961-9179
NSN 5835-01-581-8217
NSN 5985-01-368-2972
NSN 6220-01-495-0916
NSN 5835-00-859-8330
NSN 5895-01-207-3112
NSN 6130-01-236-3925
NSN 6610-00-052-8020
NSN 5998-01-455-7910