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 6320-00-450-7014
NSN 5975-01-087-5755
NSN 5925-01-088-4468
NSN 6220-01-566-1225
NSN 5945-01-370-1553
NSN 5960-01-498-0572
NSN 5965-01-495-1170
NSN 5996-01-060-4182
NSN 6685-01-525-4306
NSN 6145-01-232-7484
NSN 5935-00-824-8699
NSN 5855-01-430-9689