Selected Patents
- US patent 1629594, Stebbins, Albert H., "Air Classifier", issued 1927-05-24
- US patent 3734287, Jager, Heinz, "Air Classifier Assembly", issued 1973-05-22, assigned to WEDAG Westfalia Dinnendahl Groppel Aktiengesellschaft
- US patent 4869786, Hanke, Ernst W., "Air Classifying Process and Air Classifier", issued 1989-09-26, assigned to Pfeiffer, Christian
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“The final flat of the hoe’s approval stamp
Is reserved for the bed of a few selected seed.”
—Robert Frost (1874–1963)