Another along the MP line. I can't tell from the photo but i'm sure the one on the left is a CD 147 NN. I'll get out and check again sometime (if it's still there). As for what these were used for. It was either the WUT wires or part of MO-PAC's comm system. Not all of the poles had sidepins. Some had a 10' crossarm at the top with just the 2 wires on one side.