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 6135-01-652-4521
NSN 6320-01-227-2648
NSN 4140-01-277-4490
NSN 5996-00-357-0993
NSN 5855-00-256-5562
NSN 5996-00-381-4878
NSN 2925-01-065-0060
NSN 5965-01-090-6245
NSN 5985-01-474-5141
NSN 5985-00-959-7190
NSN 5985-01-573-6029
NSN 6150-00-811-5881