Inventor
PELLEGRIN MURRAY
US4 patents
Patents
4 patentsUS7007753B2Mar 7, 2006
Top drive swivel apparatus and method
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US7249632B2Jul 31, 2007
Top drive swivel apparatus and method
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US7845408B2Dec 7, 2010
Top drive swivel apparatus and method
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US7500518B2Mar 10, 2009
Top drive swivel apparatus and method
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