# Relationship history for MSHA mine 1518649

Current hierarchy: **Robert L  Blanton → Twin Resources L. L. C. → No. 1**

- 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:** Twin Resources L. L. C. → No. 1; 2003-07-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Edsel H  Preece et al → No. 1; 2003-07-21 to 2004-10-31; source msha-controller-operator-history
- **controller_controls_operator:** Edsel H  Preece et al → Twin Resources L. L. C.; 2003-07-21 to 2004-10-31; source msha-controller-operator-history
- **controller_controls_mine:** Robert L  Blanton → No. 1; 2004-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert L  Blanton → Twin Resources L. L. C.; 2004-11-01 to current/open; source msha-controller-operator-history