CA2022588CCA 2022588CA2022588ACA2022588CCA 2022588 CCA2022588 CCA 2022588CCA 2022588 CA2022588 CA 2022588CA 2022588 ACA2022588 ACA 2022588ACA 2022588 CCA2022588 CCA 2022588C
Authority
CA
Canada
Prior art keywords
axis
rakes
rake
angle
support
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US07/487,353external-prioritypatent/US4974407A/en
Application filed by IndividualfiledCriticalIndividual
Publication of CA2022588A1publicationCriticalpatent/CA2022588A1/fr
Application grantedgrantedCritical
Publication of CA2022588CpublicationCriticalpatent/CA2022588C/fr