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Screw%20Head%20-%20Robertson.svg
Screw%20Head%20-%20Robertson.svg
http://commons.wikimedia.org/wiki/Special:FilePath/Screw%20Head%20-%20Robertson.svg
Robertson drive
P2910
Q27850015-4e7b2f36-41ad-fb54-9c3c-06431b423775
P2910
Screw%20Head%20-%20Robertson.svg
http://commons.wikimedia.org/wiki/Special:FilePath/Screw%20Head%20-%20Robertson.svg