| 1933 | Ernst and Hermann Mahle assume equal shares as sole business partners in EC
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| 1934 | Patent filed for "Turbometal" a dense metal mesh for air filters
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| 1935 | Foundation of MAHLE Pension Club for payment of old-age pensions to former employees and their families
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| First profiled pistons compensating for the thermal expansion of pistons and cylinders
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| 1937 | Foundation of MAHLE Siedlung GmbH (MAHLE Residential Estate)
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| Series production of oil bath air filters
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| 1938 | EC converted into MAHLE KG, introduction of MAHLE logo
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| Production of the first blank cylinders using centrifugal casting process |