The company was founded in 1945, just a few weeks after the end of World War II, by Fritz Sennheiser (1912–2010] and seven fellow engineers of the University of Hannover in a laboratory called Laboratorium Wennebostel (shortened, "Lab W"). The laboratory was named after the village of Wennebostel in the municipality of Wedemark to where it had been moved due to the war. Its first product was a voltmeter. Lab W began building microphones in 1946 with the DM1, and began developing them in 1947 with the DM2. By 1955, the company had 250 employees, and had begun production of many products including but not limited to: geophysical equipment, the Noise-Compensated microphone (DM4), microphone transformers, mixers, and miniature magnetic headphones.

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