Siemens/Murray are now what was Arrow Hart, Gould, ITE, Crouse Hinds, and IIRC, Sears "Homart" brand (I think was a relabeled Murray panel, someone correct me if I'm wrong) Cutler Hammer (or EATON as the newer breakers are now showing exclusively) took over Bryant, Westinghouse and one other brand I think..
I've always wondered why All the above manufacturers have designed their breakers to fit GE THQP panels with the t slot in the bottom. GE is the only company I've ever found where this would be needed
