4. Earth working
  5. Rolling, rotating or orbitally moving tool
  6. Detailed disk structure per se

Douglas G. Bruce

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Agricultural disc

Earth working – Rolling – rotating or orbitally moving tool – Detailed disk structure per se
Patent

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Anhydrous ammonia knife

Planting – Liquid or gas soil treatment – Treating substance includes ammonia
Patent

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Earth working disc with large notches

Earth working – Rolling – rotating or orbitally moving tool – Detailed disk structure per se
Reexamination Certificate

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Earth working sweep

Metal tools and implements – making – Blank or process – Shovels
Reexamination Certificate

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Method of making an earth tilling sweep from disc scrap

Metal working – Plow or cultivator iron making
Patent

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Profile ID: LFUS-PAI-P-1049570

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