These are the two versions of brown 25kV line posts in use on the Tillamook, OR. PUD system. The one on the left is an A.B. Chance. The one on the right is a Lapp, but I have another just like it that has the famous G. E. logo. My guess is that is was made for General Electric by Lapp. The Lapp or GE version is not near as common on TPUD lines as the Chance type. Again, there are no 'U Numbers' for line posts, but I think there should be!