1942 - founded by Per Vilhelm Brüel (b. 15 March 1915) and Viggo Kjær (b. 5 June 1914) on November 28; Brüel & Kjær met when studying at the The Polytechnic School in Copenhagen (now The Technical University of Denmark), graduating in 1939 with MSc. Their company developed instruments for acoustic measurements; now a multinational;