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in subjects: "Agricultural instruments"  
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Primary view of Pusher Attachment for Tractors.
Records, Paul A.
August 24, 1920
Primary view of Oil-Expressing Cage and Press.
Henry, Nelson B.
October 26, 1920
Primary view of Weevil-Exterminator
Roe, Charles C.
December 13, 1921
Primary view of Automatic Rotary Weighing-scale.
Henderson, Robert L.
September 28, 1920
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