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- Eugen Langen: Entrepreneur, engineer and inventor, involved in the development of the petrol engine and the Wuppertal monorail.
- Max von Laue: Discoveries regarding the diffraction of X-rays in crystals.
- Ernst Lecher: He is remembered for developing an apparatus— "Lecher lines"—to measure the wavelength and frequency of electromagnetic waves.
- Gottfried Wilhelm Leibniz: Philosopher known for discovering the mathematical field of calculus and coherently laying down its basic operations in 1684.
- Georg Christoph Lichtenberg: German scientist credited with the development of the electrophorus.
- Justus von Liebig: German chemist who made contributions to agricultural and biological chemistry.
- Otto Lilienthal: Father of Aviation and first successful aviator. Main discovery was the properties and shape of the wing.
- Carl von Linde: Engineer who, among other things, developed refrigeration and gas separation technologies.
- Walter Linderer: Father of the airbag.
- Alexander Lippisch: Pioneer of aerodynamics, his most famous design is the Messerschmitt Me 163.
- Ernst Litfaß: free-standing cylindrical advertising column.
Read more about this topic: List Of German Inventors And Discoverers