Any Idea What These Are?

Thanks guys, My dad said it was an indexer but he wasnt sure how to use it. he got it in a garage sale package.
I dont know where the taper attachment picture came from, its on my lathe and I know what it is but I tried to delete it but it wouldnt let me.
 
The indexer should have a threaded collar on the front that comes off to mount a small lathe chuck to it. It looks like it does. It would be that knurled collar.

Actually, isn't that a quick change collet holder on the indexer? It looks like it was setup for a specific task in the horizontal mode.
 
The lever opens and closes the collet. There are screws in the back that get backed out at the places to index to. The knurled ring in the front is to protect the threads for adding a lathe chuck or face plate.
I have used these many times through the years. They work great for multiple parts because you can put a collet stop in the collet to set where the parts stops.
 
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