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 5905-01-448-2787
NSN 5985-01-485-0456
NSN 5855-01-464-3152
NSN 5999-01-454-8240
NSN 5960-01-276-7836
NSN 5895-01-390-9672
NSN 5960-01-199-1157
NSN 5930-01-214-1432
NSN 6645-00-300-0401
NSN 6320-01-103-6218
NSN 6150-00-112-2458
NSN 5835-00-136-2322