Patent classifications
A
HUMAN NECESSITIES
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A01
AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
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A01B
SOIL WORKING IN AGRICULTURE OR FORESTRY; PARTS, DETAILS, OR ACCESSORIES OF AGRICULTURAL MACHINES OR IMPLEMENTS, IN GENERAL
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3/00
Ploughs with fixed plough-shares
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A01B3/46
Ploughs supported partly by tractor and partly by their own wheels
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A01B3/464
Alternating ploughs with frame rotating about a horizontal axis, e.g. turn-wrest ploughs
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