Looks like die gouges. They flow behind the devices, so they are on the outside edge of the die. Nothing during a clash would make these:
They're too irregular in width to be from die polishing. I'm wondering if they came from a heavier metal brush, possibly like one that would be used to remove grease or dirt from a die. Chris
looks like die gouges possibly from feeder fingers scraping the die...http://www.error-ref.com/die-gouges/
As Coop said, they are too irregular for feeder finger damage. They would be parallel, at an angle. They do look similar in size. Those are some wild die scrapes!
