04526236 is referenced by 15 patents and cites 5 patents.

A single disc field marker comprises a support arm pivotally mounted on the end of the sprayer boom and carrying on its end a rotatable disc. The disc is supported so that in one position it lies in a plane which is substantially vertical and parallel to the direction of motion of the boom and can be adjusted readily by movement of the support arm through 90 to a second position in which the outer surface of the disc is inclined so the top edge is outward of the bottom edge and the rear edge is inward of the front edge. The first position can be used to form a furrow in bare land and the second position can be used with standing crop to gently lie the crop to one side.

Title
Field marker for a sprayer boom
Application Number
6/579448
Publication Number
4526236
Application Date
February 13, 1984
Publication Date
July 2, 1985
Inventor
Ralph O Jacobsen
Kyle
CA
Agent
Stanley G Ade
Assignee
Kyle Welding & Machine Shop
CA
IPC
A01B 69/02
View Original Source