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 6220-00-554-5937
NSN 5950-01-247-7400
NSN 5915-01-525-0479
NSN 5998-01-461-2003
NSN 5855-01-499-4139
NSN 6685-01-467-8789
NSN 5855-00-688-9954
NSN 6135-01-353-3802
NSN 5910-00-426-2803
NSN 6320-00-107-5291
NSN 5905-01-560-6910
NSN 5999-01-344-0102