4. Traversing hoists
  5. Having vertically swinging boom
  6. Having means to swing boom vertically

James C. Kennard

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Pickup truck derrick with traveling sheaves

Traversing hoists – Having vertically swinging boom – Having means to swing boom vertically
Patent

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Portable and collapsible derrick structure

Traversing hoists – Having means facilitating assembly or disassembly – Of traversing hoist from support
Patent

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Portable and collapsible derrick structure

Traversing hoists – Having means facilitating assembly or disassembly – Of traversing hoist from support
Patent

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Profile ID: LFUS-PAI-P-413106

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