Ever hear of a Clevis Wrench?

[Ill Digger]

I found this on a tool forum:
Single/double trees are attached to horse/mule implements by a clevis. Some companies used their implement wrenches as the clevis pin. The pin would go through the implement beam and be there if you needed a wrench.

In order to attach the farm machinery to the horse or mule, a clevis was used; in this case a clevis pin wrench. This multi-functional tool was used to tighten various nuts and bolts on the machinery.

Makes sense. Another multipurpose tool.