# Relationship history for MSHA mine 1518804

Current hierarchy: **Sandra D  Grubb; Henry M  Smith → DAVIS BEND COAL CO., LLC → DAVIS BEND # 2**

- 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:** Sandra D  Grubb  et al → DAVIS BEND # 2; 2004-05-18 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** DAVIS BEND COAL CO., LLC → DAVIS BEND # 2; 2004-09-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sandra D  Grubb  et al → DAVIS BEND COAL CO., LLC; 2004-09-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Henry M  Smith  et al → DAVIS BEND COAL CO., LLC; 2004-09-27 to current/open; source msha-controller-operator-history