Japanese electronics maker Panasonic Corp has agreed to buy a majority stake in U.S. refrigeration systems maker Hussmann from a private equity firm for over 150 billion yen ($1.2 billion), people familiar with the matter said on Monday. Panasonic agreed to buy the stake from Clayton Dubilier & Rice, said the people, who declined to be identified as they were not authorized to speak with media on the matter. Clayton Dubilier & Rice bought the stake from industrial conglomerate Ingersoll-Rand PLC (IR.N) in 2011.