Civil war artifacts??

[acm3]

Found these today in the Federal camp I have been hitting for several months. I am not sure about the "iron" finds. One looks like a thin tool of some sort (or part of a pocket knife). The other looks like a fragment from a bomb or cooking pot maybe. The last one has a hex nut top and threads (fuse or modern hardware?) Thanks for looking!

 

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[SkaBa]

Nice finds.

 

[nhbenz]

The only one I think I know is a knapsack j-hook, to the left of the bullets