Müller was a manufacturer of large four-wheel drive tractors and construction machinery in Brazil. Founded in 1956, Müller began building farm tractors in the mid 1970s based on their compactors. The Müller tractor line expanded and ever larger models were added into the mid 1980s. Increased competition from global brands put Müller into decline in the 1990s and production ended in 2002. Proton Primus, also of Brazil, acquired the design rights to Müller machinery.