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The declared useful model relates down agricultural machine building and can be used before the grain-harvesting combines of classical diagram, or multidrum. The technical result of the realization of the declared useful model consists before an increase in the velocity of the re-equipment of grain-harvesting combine as far as the harvesting of field crops or cereal crops, the decrease of the labor intensity and expenditure of human resources. Technical result is reached as far as the fact, the construction of sounding board makes it possible to re-equip grain-harvesting combine based on the harvesting of grains to the harvesting of field crops or vice versa without the dismantling of sounding board due to the application in the construction of the bars of different diameter, executed with the possibility of dismantling and subsequent installation.