Inventor
MASON DAVID B
US6 patents
Patents
6 patentsUS5340182AAug 23, 1994
Safety elevator
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US7287544B2Oct 30, 2007
Triple valve blow out preventer
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US6776070B1Aug 17, 2004
Iron roughneck
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US7121295B2Oct 17, 2006
Internal blow out preventer ball and seat
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US6915857B2Jul 12, 2005
Non-seize material attachment for a drill slip system
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US6758280B2Jul 6, 2004
Non-seize material attachment for a drill slip system
VARCO INT0 citations38