4. Earth working
  5. Diverse tools
  6. Second implement follows path of first

David L. Hutchins

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Box scraper with plural blades

Earth working – Diverse tools – Second implement follows path of first
Patent

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Underwater acoustical transducer

Communications – electrical: acoustic wave systems and devices – Signal transducers – Underwater type
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Profile ID: LFUS-PAI-P-342032

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