Yep—these are tuff ones but I bet they glow like heck—pretty cool that.
The upper left may just be a swirl.
The upper right shows a nice big CAC like cutoff in the last image.
The lower left is either a Peltier or an Akro imho.
The lower right---no clue.
I looked and gave an opinion, I hope to see some more opinions.
Marble—On!!