madman, the first picture is some kid of support or bracket from a horse pulled plow or something along those lines. the second is a plow blade or edge as some people call it. the third looks like some kind of tool. manufactures back then use to make all kind of wrenchs to go along with their equipment.
The third picture is of an Alligator wrench.Usually one side of the jaws will have teeth and the other side will be smooth.The reason for this is that one wrench of this design can fit several different size nuts or bolts.If you do a search on alligator wrenches on ebay you will see several like yours and some a little different.