sentences:  In a letter dated 13 June 1930 to Delahaye, the company's president stated that it seemed quite impossible to continue the collaboration as it was then working, and the collaboration was formally dissolved at the end of September 1931, the fifteen intervening months having been used by the partners to configure their separate model ranges, although some "run-out" models from the period of the collaboration continued to appear after 1931.Front independent suspension was introduced on some 1934 models and also front-wheel drive using Grégoire designs on the Super Aigle models but this was not a great success as it was launched at the same time as the Citroën Traction Avant but was considerably more expensive.In the same year the Aigle 8 with V-8 engine was launched.