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 6220-00-660-5539
NSN 5950-01-286-0679
NSN 5990-01-630-0456
NSN 5950-00-255-6264
NSN 5998-01-495-2961
NSN 6145-00-350-0167
NSN 4140-01-362-7174
NSN 6220-01-260-7169
NSN 6240-01-586-9718
NSN 5945-00-899-3095
NSN 5945-00-369-8757
NSN 5998-01-188-7555