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| Number | Title | Issue Date |
| 6485401 | Process for drilling oil-holes in crankshafts A process for drilling oil holes in a crankshaft at various positions lengthwise and widthwise about a longitudinal axis of the crankshaft, where the oil holes are perpendicular to and have angled directions with regards to the longitudinal axis. The proc... | 11/26/2002 |
| 6203478 | Machine for drilling oil holes in crankshafts A machine for drilling oil-holes in crankshafts and the corresponding procedure. It can be used to drill one, two or more crankshafts per cycle. Each crankshaft can revolve on its own axis. The unit described is mounted on a horizontally-faced rotary tabl... | 03/20/2001 |