| Simple Machine Invention: Rolly |
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About this machine: Our machine shoots, rolls, and drills. It’s for our friends. It is 6 inches. It has gears, pulleys, and a screw. It can drill. It’s $1,050. |
| LINKS> | http://sln.fi.edu/qa97/spotlight3/spotlight3.html
http://www.coe.uh.edu/archive/science/science_lessons/scienceles1/plane.htm |