Below is a list of excerpts from Claas patents relating to the subject of "choppers".

Note: The decisive factor for a patent is always the "claims", as specifically what exactly the applicant claims as his invention!

This application describes the principle of the "RU" corn header:

https://worldwide.espacenet.com/patent/search/family/006533558/publication/DE19535453A1?q=DE19535453

This registration concerns the successor model of the "RU", the "Orbis":

https://worldwide.espacenet.com/patent/search/family/056082191/publication/DE102014118678A1?q=DE102014118678

Here is an application for a modular frame extension to accommodate a rowtrack:

https://worldwide.espacenet.com/patent/search/family/062486474/publication/EP3449714A1?q=EP3449714

 In connection with the row-trac, this application is about being able to remove a "conditioning element" (the corn-cracker) above the tracs sidewards out of the machine:

https://worldwide.espacenet.com/patent/search/family/062486498/publication/CN109417901A?q=EP3449713