I don't know the differences but here is the Patent http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.h

I don't know the differences but here is the Patent http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.htm&r=1&f=G&l=50&s1=D599,372.PN.&OS=PN/D599,372&RS=PN/D599,372 http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sec...