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 5998-01-215-6727
NSN 6130-01-619-1307
NSN 6320-01-250-0290
NSN 5975-00-300-2371
NSN 5855-00-247-7219
NSN 6110-00-350-5518
NSN 5945-01-046-8181
NSN 5950-01-033-0890
NSN 6610-01-435-8982
NSN 4140-00-492-2468
NSN 5998-01-647-0937
NSN 5915-00-636-9785