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 5985-01-215-1677
NSN 7035-01-527-7446
NSN 5935-01-397-1818
NSN 5999-01-012-2449
NSN 7035-01-397-5009
NSN 5925-01-077-3137
NSN 4140-01-659-6573
NSN 5975-01-555-8533
NSN 6105-01-374-9912
NSN 5990-00-477-1362
NSN 5998-00-187-7730
NSN 6610-01-378-7379