It was sold to Siemens & they brought back the original name, Murray, and sold both Murray, and Siemens (Formerly ITE) equipment at the same time, a few years ago they discontinued Murray, it's OK to use Siemens in them, but Crouse-Hinds used to label their panels as OK to use ITE EQ-P and Bryant BR breakers in them, ITE is now Siemens, & Bryant has had a few name changes but is now Eaton BR, but I call Eaton BR, "Zinsco II" because they are the worst panel on the market & share some Zinsco heritage. Somewhere I have the paperwork from UL saying it's OK to use Siemens in Murray products.
Crouse-Hinds & Challenger had breakers that would allow 240V circuits to be supplied with a twin breaker, they were problematic & now obsolete.