# Relationship history for MSHA mine 1518672

Current hierarchy: **Randall  Wagers → Sandhill Coal Processing Co. → Sandhill Coal Processing**

- 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:** Randall  Wagers et al → Sandhill Coal Processing; 1992-03-13 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Sandhill Coal Processing Co. → Sandhill Coal Processing; 2003-09-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Randall  Wagers et al → Sandhill Coal Processing Co.; 2003-09-17 to current/open; source msha-controller-operator-history