1. CONSTANT-G CONTROL

Serial Number: 77696862
Owner: (REGISTRANT) National Oilwell Varco, L.P. NOW Oilfield Services, Inc., a Delaware corporation LIMITED PARTNERSHIP DELAWARE 7909 Parkwood Circle Drive Houston TEXAS 77036
Filed on: 03/23/2009

2. DURAFORCE

Serial Number: 77788764
Owner: (REGISTRANT) National Oilwell Varco, L.P. NOW Oilfield Services, Inc., a Delaware corporation LIMITED PARTNERSHIP DELAWARE 7909 Parkwood Circle Drive Houston TEXAS 77036
Filed on: 07/24/2009

3. EHAWK

Serial Number: 85570602
Owner: (REGISTRANT) National Oilwell Varco, L.P. NOW Oilfield Services, Inc., a Delaware Corporation LIMITED PARTNERSHIP DELAWARE 7909 Parkwood Circle Drive Houston TEXAS 77036
Filed on: 03/15/2012

4. RIGMS

Serial Number: 77635305
Owner: (REGISTRANT) National Oilwell Varco, L.P. NOW Oilfield Services, Inc., a Delaware corporation LIMITED PARTNERSHIP DELAWARE 7909 Parkwood Circle Drive Houston TEXAS 77036
Filed on: 12/17/2008

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