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