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It would appear to be like an early version of Octalink,
Velobase has a picture of the crank and Splined BB Spindle together -
http://velobase.com/ViewComponent.aspx?ID=9C269065-D293-4CE2-B227-3B24DB122D4E&Enum=115&AbsPos=2
SideshowBob
So just how do the cranks attach?