# Relationship history for MSHA mine 0202632

Current hierarchy: **Pioneer International Ltd → Wickenburg Concrete & Materials → MONARCH 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

- **controller_controls_mine:** Edwin P  Dillard → MONARCH PIT; 1984-12-01 to 1998-03-17; source msha-controller-operator-history
- **operator_operates_mine:** Wickenburg Concrete & Materials Inc → MONARCH PIT; 1994-11-01 to 1998-03-17; source msha-controller-operator-history
- **controller_controls_operator:** Edwin P  Dillard → Wickenburg Concrete & Materials Inc; 1994-11-01 to 1998-03-17; source msha-controller-operator-history
- **operator_operates_mine:** Wickenburg Concrete & Materials → MONARCH PIT; 1998-03-18 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Pioneer International Ltd → MONARCH PIT; 1998-03-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Pioneer International Ltd → Wickenburg Concrete & Materials; 1998-03-18 to current/open; source msha-controller-operator-history