4. Traversing hoists
  5. Traveling bridge
  6. Having vertical supporting legs

J & R Engineering Company, Inc.

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Dual beam header connector plate

Traversing hoists – Traveling bridge – Having vertical supporting legs
Patent

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Extendible boom with locking mechanism having equalizer...

Traversing hoists – Having boom shiftable vertically along a linear path – Fluid actuated
Reexamination Certificate

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