Found A Few More Mystery Tools.

That is a T-Slot Clamp. It is keyed into the slot and fastened to the T-nut im the slot. The screw hold the part etc. to the table. That would be a good clamp to hold a Machinist Vise in place. The bolt and T-nut are missing.

"Billy G"
 
I have the bolts for them . Just removed for the pics.
 
The second picture is probably the hold downs for the first picture...
 
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