easiest way to describe it is to compare the pedal ends of the top 2 cranks in that pic, the full wraparounds have crank arm all the way round the pedal mounting piece (and the spindle mount with the bolt) & its almost like they have pierced the crank arm (there is crank arm wrapped all the way round them)
then in the 2nd one down you can clearly see the pedal mounting piece is just welded onto the rnd of the crank arm as is the spindle mount, then the pinch bolt is just welded onto the back of that!
its a little hard to desribe but have a close look at the pics & you'll see
i have a larger version of that image i can mail you if you like?