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21 Posts
They did this back in 04.
Link to patent:
http://patft1.uspto.gov/netacgi/nph...6,895,919.PN.&OS=PN/6,895,919&RS=PN/6,895,919
Link to patent:
http://patft1.uspto.gov/netacgi/nph...6,895,919.PN.&OS=PN/6,895,919&RS=PN/6,895,919