# Relationship history for MSHA mine 1518429

Current hierarchy: **Bill  Detherage → MSD Mining Company, Inc. → Mine #7**

- 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:** Bill  Detherage → Mine #7; 2000-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Roco Enterprises Inc → Mine #7; 2001-08-01 to 2002-04-30; source msha-controller-operator-history
- **controller_controls_mine:** Robert O  Roan → Mine #7; 2001-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert O  Roan → Roco Enterprises Inc; 2001-08-01 to 2002-04-30; source msha-controller-operator-history
- **operator_operates_mine:** MSD Mining Company, Inc. → Mine #7; 2002-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bill  Detherage → MSD Mining Company, Inc.; 2002-05-01 to current/open; source msha-controller-operator-history