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Robertson%20screw.jpg
Robertson%20screw.jpg
http://commons.wikimedia.org/wiki/Special:FilePath/Robertson%20screw.jpg
Robertson drive
P18
Q27850015-780E23A6-B4EE-4FF4-BF3B-EB08D368AF98
P18
Robertson%20screw.jpg
http://commons.wikimedia.org/wiki/Special:FilePath/Robertson%20screw.jpg