TY Baker
I think you're saying this but I don't see you saying it outright, but both of those Contractor logos are just the masonic compass + square.
http://www.themasonictrowel.com/masonic_talk/stb/stbs/36-07.htm
https://masonicshop.com/masonic-library/books/Ancient%20Religious%20Traditions%20and%20Symbols%20-%20H%20Sykes.pdf
They believed the soul, or spirit, must be furnished by the
sacrifice of a living human being who was crushed to death under
the cornerpost or cornerstone
Dropping a crane on someone certainly satisfies the "crushed" criteria.