Te two similar items look like a depth setting-something and the raker item looks like it was for spreading glue. But, don;t think I am right on these.
I keep one of those butt marking gauges on my band saw. It sticks to a magnet. I'll often use it to mark the center line of a rough piece of wood I'm ripping in half.
Sorry for the lousy photo, but its all I could come up with at the moment.