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if you are looking at longer then below can do upto 45m with a lot of ''signal'' (data via cable) for printers etc....
You can buy a set of special adaptors. In the middle you would run network cable..
+1
USB to Cat5 adapter at point A ... then network cable as your extension .... then a Cat5 to USB adapter at point B
Some of these adapters allows for extensions up to 100M
Edit: http://techstudio.co.cc/wp-content/uploads/2011/03/media_1286479948608.png