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Agricultural machinery
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18
Tobacco -- Research
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18
Agricultural engineering
11
Agricultural mechanics
8
Tobacco curing
4
Agricultural engineers
2
Agricultural experiment stations
2
Freeze-drying
2
Tobacco industry
2
Tobacco use -- Health aspects
2
Automation -- Human factors
1
Design -- Human factors
1
Harvesting machinery
1
Human engineering
1
Lifting and carrying
1
Tobacco -- Harvesting
1
Transplanting (Plant culture)
1