# Relationship history for MSHA mine 2300231

Current hierarchy: **Gale L  Wilkerson → Wilkerson Brothers Quarry Inc → WILKERSON BROS. QUARRY, INC.**

- 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:** Wilkerson Brothers Quarry Inc → WILKERSON BROS. QUARRY, INC.; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Gale L  Wilkerson et al → WILKERSON BROS. QUARRY, INC.; 1950-01-01 to 2026-04-09; source msha-controller-operator-history
- **controller_controls_operator:** Gale L  Wilkerson et al → Wilkerson Brothers Quarry Inc; 1950-01-01 to 2026-04-09; source msha-controller-operator-history
- **controller_controls_operator:** Darrel R  Wilkerson et al → Wilkerson Brothers Quarry Inc; 1950-01-01 to 2026-04-09; source msha-controller-operator-history
- **controller_controls_mine:** Gale L  Wilkerson → WILKERSON BROS. QUARRY, INC.; 2026-04-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gale L  Wilkerson → Wilkerson Brothers Quarry Inc; 2026-04-10 to current/open; source msha-controller-operator-history