What type of details about oskar kellner can be gathered from the following bio? Bio: oskar -lrb- oscar -rrb- johann kellner -lrb- 13 may 1851 , tillowitz , upper silesia - 12 september 1911 , karlsruhe -rrb- was a german agricultural scientist -lrb- '' agrikulturchemiker , tierphysiologe '' -rrb- .
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