05054559 is referenced by 5 patents and cites 23 patents.

A cultivator for such crops as beets, maize, potatoes, etc., planted in rows. A machine frame can be mounted on the three-point hitch of a tractor. Several chopping tools mounted on it, can be detached from tool holders, and are rotated on vertical shafts. Force from a common drive mechanism is distributed to the shafts through a transmission. Each tool is rotated by one shaft and is mounted on a parallelogram. Each chopping tool (20) has one or more brushes that can be secured to the tool holder (18) and that have bristles of a flexible and resilient material and is shaped like an inverted flower pot. A stop (22) that rests against the ground at a level that can be adjusted in relation to the tool is accommodated in the inside (21) of the tool and can be detached from its center.

Title
Soil-working machine for plants grown in rows
Application Number
7/549462
Publication Number
5054559
Application Date
July 6, 1990
Publication Date
October 8, 1991
Inventor
Karl Heinz Paul
Zur Wilde 8, D - 3590 Bad Wildungen-Wega
DE
Agent
Max Fogiel
IPC
A01B 33/28
A01B 33/06
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