PORTADRILLMINI® DRILL - PENNSTATE UNIVERSITY TEACHING DRILLING; FILMED ON LOCATION AT PENNSTATE PROPERTY -SHALE HILLS UNIT. GEOLOGY & MECHANICAL ENGINEERING DEPARTMENT PROJECTS. PORTADRILLMINI DRILLING ON SHALE HILL THROUGH ROCK FORMATIONS - RED SHALE AND GRAY SHALE USING THE AIR INJECTION METHOD. PLEASE VISIT WWW.PORTADRILLMINI.COM FOR MORE INFORMATION. PORTADRILLMINIPORTADRILLMINI® DRILL - PENNSTATE UNIVERSITY DRILLING IS A REGISTERED TRADEMARK NAME. U.S. PATENT #6315059
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