# Relationship history for MSHA mine 0301821

Current hierarchy: **Haskell  L  Dickinson II → Mc George Contracting Company Inc → COPPERHEAD QUARRY**

- 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:** Haskell  L  Dickinson II et al → COPPERHEAD QUARRY; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mc George Contracting Company Inc → COPPERHEAD QUARRY; 2000-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Haskell  L  Dickinson II et al → Mc George Contracting Company Inc; 2000-05-01 to current/open; source msha-controller-operator-history