Steven M. Tipton, a professor at the University of Tulsa, wrote a letter confirming that Luiz Gustavo Oliveira Lima worked as an intern in his Coiled Tubing Laboratory for two months during the summer of 2015. The letter states that Luiz worked over 200 hours and did an excellent job assisting with research and daily lab operations.

1. 800 South Tucker Drive • Tulsa, Oklahoma 74104-9700 • 918-631-2521 • Fax: 918-631-2397
www.utulsa.edu/me
An Equal Opportunity/Affirmative Action Employer
Department of Mechanical Engineering
December 21, 2015
To whom it may concern,
I am writing to confirm that Luiz Gustavo Oliveira Lima worked at my Coiled Tubing
Laboratory as Lab intern, during the summer of 2015, for two months. Luiz worked over
200 hours of work. Luiz did an excellent job assisting with the research and the everyday
operation of the lab.
Sincerely,
Steven M. Tipton, Ph.D., P.E., FASME, FASM
Frank W. Murphy Distinguished Professor of Mechanical Engineering
The University of Tulsa
Stephenson Hall 2060
Tulsa, OK 74104
918-631-2994 (TU)
918-850-0252 (cell)