Has some similarities to a saw vise.
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Thing A Majig. Really nice one too.
I think your mistaken. At least where I come from that is a whatchamacallit

Has some similarities to a saw vise.
I'm inclined to agree that's what it is, though I'm puzzled by why the jaws pivot.
It appears to me that to be used it must be mounted as shown. There not collapsible unless you are going to build the frame at each location.
Saw vises are something I have no experience with. Not really a wood worker altho I'd be willing to learn if the opportunity was presented. Every time I had a construction job something happened and I didn't stick with it.