The largest combine harvester manufacturer in Europe, Ködel & Böhm, had produced nearly half a million combine harvesters when it introduced its first combine harvester, the Köla SM 3, to the market in 1951. This was a self-propelled combine equipped with a 230 cm cutting table and a 52 hp diesel engine. Later, the SM 4 with a 10 cm wider cutting table was introduced alongside the GM 4, a pull-type combine harvester with its own engine.

The threshing drum of the SM 3 and 4 was a full 150 cm wide. The width of the single-section beater was the same. Bagging equipment was standard, and a grain tank was available at an extra cost. The height adjustment of the cutting table was hydraulic, and the height of the straw walker was adjusted with a lever from the driver's seat. The speed of the threshing drum could be adjusted steplessly. Standard grain sieves were 8, 10, 12, and 14 millimeters.

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