Does anyone have any into on the Harrison Heaters? Like company info/history?

Trying to date a Harrison heater (the triangular type) that was a dealer option and used during the war (GM still disavows any knowledge of 1942-1945 ever happening).

I don't even have a model number. It the triangular type, with the two bottom vents that pointed towards the drivers side. No defrost... just off/on for the fan and no baffles.

Thanks!