4. Earth working
  5. Overload shifting
  6. Against spring return device

David A. Dobson

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Locking wing lift mechanism for farm implements

Earth working – Plural wheeled implements – Outrigged implement adjustable inwardly
Reexamination Certificate

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Spring tip shank assembly having quick-dropping trip-out force a

Earth working – Overload shifting – Against spring return device
Patent

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Profile ID: LFUS-PAI-P-1284303

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