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 6320-01-450-7513
NSN 5910-01-328-7909
NSN 7035-00-104-7613
NSN 5985-01-006-3150
NSN 6130-00-604-9462
NSN 5910-00-158-8786
NSN 5920-01-491-7441
NSN 5930-00-687-2059
NSN 5930-00-176-4065
NSN 6105-01-460-8248
NSN 5935-00-220-3879
NSN 5925-01-172-0036