I would like to thank Baker Hughes Incorporated for allowing me to use illustrations from their catalogs, technical papers, and brochures. More information on these materials, and about the company in general, can be found at www.bakerhughes.com.
Thanks to National Oilwell for the use of illustrations from their catalogs, which can be found at www.nationaloilwell.com.
We also give thanks to Logan Oil Tools for supplying illustrations used in this book. You can find additional information at www.loganoiltools.com.
EV Downhole Video was also very helpful, supplying technical information and captions for their downhole video cameras. Check the company’s website at www.evcam.com.