# Relationship history for MSHA mine 1518252

Current hierarchy: **Ricky D  Kirk; Jerry  Wells Jr → Carbon River Coal Corp → 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:** Ricky D  Kirk  et al → Mine #7; 1984-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jerry  Bentley et al → Mine #7; 1997-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Simp-A-Lex Inc → Mine #7; 2000-04-01 to 2000-10-31; source msha-controller-operator-history
- **controller_controls_operator:** Jerry  Bentley et al → Simp-A-Lex Inc; 2000-04-01 to 2000-10-31; source msha-controller-operator-history
- **operator_operates_mine:** Carbon River Coal Corp → Mine #7; 2000-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ricky D  Kirk  et al → Carbon River Coal Corp; 2000-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jerry  Wells Jr  et al → Carbon River Coal Corp; 2000-11-01 to current/open; source msha-controller-operator-history