Nobahamas may have been asking "What's to stop GE / Siemens / DMG Mori Seiki etc. (or Arcam) from making their own LASER machines?" If not, I see that as a good question. I've heard that the laser technology is more open (available) but don't know what, if any, limitations there are.
I don't have any real understanding on how patents legally (i.e. exact protection terms) protect inventors and manufacturers.
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