RJ Helferich - US Patent 8,116,741, 2012 - Google Patents
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RJ Helferich - US Patent 8,560,006, 2013 - Google Patents
Related US Application Data (60) Continuation of application No. 13/109.437, filed on May 17, 2011, now Pat. No. 8,374,585, which is a division of application No. 12/167,971, filed on …
T Ahopelto, T Romppanen, M Ahtisaari… - US Patent …, 2012 - Google Patents
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