Messing around a little during recovery and I had my daughter bring a couple of cranksets to me for inspection and clean up. One is a Peugeot branded Stronglight 99 with 52/40 chain rings. I know this is an 86bcd crankset. The outer ring has 2 extra holes in it. I'm assuming the furthest one out would have been for a chain protector. But what about the middle hole?

I've had this crankset in a drawer for awhile and never really looked at it. The outer hole in the big ring is countersunk on the back side but the middle hole is not on either ring.

Any wisdom in why the extra holes are there?