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 2925-00-881-3770
NSN 6135-01-089-4888
NSN 5915-00-080-8724
NSN 6145-00-065-4337
NSN 5999-00-077-4567
NSN 5960-00-170-4596
NSN 5935-00-718-5914
NSN 6685-01-649-8166
NSN 6240-00-145-8167
NSN 6610-01-149-1465
NSN 5975-01-448-9405
NSN 6685-00-976-0890