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 5855-01-398-9548
NSN 5990-01-287-9447
NSN 6135-01-606-0596
NSN 6610-00-421-9853
NSN 5985-01-176-4293
NSN 5996-01-542-1407
NSN 6240-00-941-5211
NSN 5985-01-008-9443
NSN 6150-01-514-9992
NSN 6150-01-311-9043
NSN 5950-01-362-4006
NSN 6135-00-851-8575