# Relationship history for MSHA mine 0202135

Current hierarchy: **McCormick Inc → Arrowhead Materials → Prescott Valley Pit**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Flintstone Industries Inc → Prescott Valley Pit; 1983-02-01 to 2003-06-30; source msha-controller-operator-history
- **controller_controls_mine:** William H  Hyslip → Prescott Valley Pit; 1983-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William H  Hyslip → Flintstone Industries Inc; 1983-02-01 to 2003-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Earth Products Concrete & Materials → Prescott Valley Pit; 2003-07-01 to 2003-12-31; source msha-controller-operator-history
- **controller_controls_mine:** McCormick Inc → Prescott Valley Pit; 2003-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** McCormick Inc → Earth Products Concrete & Materials; 2003-07-01 to 2003-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Arrowhead Materials → Prescott Valley Pit; 2004-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** McCormick Inc → Prescott Valley Pit; 2004-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** McCormick Inc → Arrowhead Materials; 2004-01-01 to current/open; source msha-controller-operator-history