# Relationship history for MSHA mine 1518118

Current hierarchy: **Robert W  Miller; Dean  Miller → Miller Brothers Coal Inc → Big Spring #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

- **controller_controls_mine:** Dean  Miller Et Al → Big Spring #1; 1981-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Miller Brothers Coal Inc → Big Spring #1; 1998-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dean  Miller Et Al → Miller Brothers Coal Inc; 1998-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert W  Miller Et Al → Miller Brothers Coal Inc; 1998-11-01 to current/open; source msha-controller-operator-history