4. Traversing hoists
  5. Having vertically swinging boom
  6. And trolley

Maynard A. Oustad

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Collapsible frame support for pivotal boom on a portable crane

Traversing hoists – Having vertically swinging boom – And trolley
Patent

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Loading and unloading crane and method of operation therefor

Traversing hoists – Having counterweight or counterbalancing means – Counterweight movable relative to load support
Patent

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Profile ID: LFUS-PAI-P-1190334

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