Position tracking and proximity warning system

Assignee

• Phelps Dodge

Inventors

• Steven Holmes (4 patents)
• Mark W. Bartlett (1 patents)
• Robert D. Coyle (1 patents)
• Russell Armbrust (1 patents)
• Donald W. Treadaway (1 patents)
• Steve Williamson (10 patents)
• James E. Hanson (6 patents)
• Jennifer D. Carpenter (1 patents)

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