Published in
Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2012, 2012
DOI: 10.1117/12.914257
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Deep drilling and sampling via the wireline auto-gopher driven by piezoelectric percussive actuator and EM rotary motor
Proceedings article published in 2012 by
Yoseph Bar-Cohen,
Mircea Badescu,
Stewart Sherrit,
Kris Zacny,
Gale L. Paulsen,
Luther Beegle 
,
Xiaoqi Bao
,
Xiaoqi Bao
