Cooper Industries (Cooper Power Systems Division http://cooperpower.com/) purchased Kearney Co. from its parent company, Dyson-Kissner-Moran Corp, in 1997. Kearney was a large manufacturer of line and power distribution equipment in its day. Not sure when they entered or left the LV distribution equipment market.
There have been other reports of these Kearney panels floating around and it has been reported that the internal labels indicated that Zinsco breakers were to be used to populate them. Not able to find any old catalogs, etc., for Kearney equipment to validate that. Hopefully someone else has a reference for it.
Hope this helps.