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 6685-01-063-7425
NSN 6110-01-081-5298
NSN 6645-01-049-0972
NSN 7035-01-421-4446
NSN 7035-00-193-2269
NSN 6240-01-262-2039
NSN 5925-00-857-4850
NSN 5960-01-307-2674
NSN 5930-01-120-9180
NSN 5985-01-185-0481
NSN 6110-00-057-6873
NSN 5895-01-618-1154