The top ruler is a 72 inch slide out ruler. Instead of folding out the sections slide out and lock.
An open ruler has a "stepback" of sections.
The next ruler is a 24 inch "fish" ruler with interesting information about fish.
The 72 inch metal folding rulers are next. One with a lot of old dirt.
The next one is some kind of specialized measuring tool. It folds in the middle and is metal.
Next down is a 12 inch Dual Rule metal ruler.
The bottom ruler is printers ruler. Picas on one side and inches on the other.
I sold off most of my collection a couple of months ago, but I didn't sell any metal rulers. I have never had many.