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 6110-01-109-0434
NSN 5905-01-472-2027
NSN 5925-01-211-7745
NSN 5925-00-492-2318
NSN 5998-01-053-6750
NSN 5975-00-686-3504
NSN 5960-00-167-7875
NSN 6130-01-442-4091
NSN 5920-00-025-0587
NSN 5915-00-394-6523
NSN 5975-01-452-9390
NSN 5975-01-088-6116