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History
 

1919
Some of the earlier production programmes were resumed. Small and medium-sized crude oil engines were built for cars and even for the bicycle.

1913
Motorenfabrik Oberursel acquired the licence to build this rotary engine and developed its own engines using the same principle. The result was 7-, 9-, 11- and 14-cylinder engines (the 14-cylinder engine being a twin-row radial engine). These engines produced between 70 and 160hp. Only after 1918 were the rotary engines surpassed in weight-to-power ratio and consumption by other engine types.

1908
The Seguin brothers developed an aircraft engine with rotating cylinders to provide improved cooling, and this was unveiled at the Paris Air Show. In deference to the Oberursel licensors, it was named the GNOME-RHONE.

1900
The 2000th GNOM was manufactured. In the meantime it had undergone a number of improvements and was installed in field railways, mine locomotives and locomobiles that were in service all over the world. Interest in Oberursel Motorenfabrik reached the highest circles, and on 22 November 1900 the Emperor Wilhelm II paid the company a 45 minute visit. A licence to build GNOM engines was granted to the French company Seguin in Lyon.

1898
The engine factory was enlarged once again and renamed Motorenfabrik Oberursel AG. The Strauss Bankers of Karlsruhe had a major financial holding in the factory and retained management of the company until the merger with Humboldt-Deutz Motoren AG in 1930.

1897
When the shareholders refused permission to install the GNOM in a car, Willy Seck left Oberursel for good. During the next few decades he was involved in the development of cars, carburettors and ignition apparatus with various car manufacturers, until he disappeared without trace in Silesia during the Second World War.

1892
Willy Seck & Co. company established. Engine construction began. Its engine became very well known and successful, winning major prizes around the world.

1891
Engineer Willy Seck succeeded in building a new injection mechanism for conventional petroleum engine in his father's workshop. The new engine was a robust one-cylinder four-stroke 4hp engine without camshaft, small but powerful. He called it the "GNOM". Some of the tradesmen in Oberursel thought the name stood for "Geht Nicht Ohne Monteur" (Won't Work Without Mechanic)!