# Relationship history for MSHA mine 1518546

Current hierarchy: **Cliff  Bartley → Cliffco Enterprise, Inc. → No. 9**

- 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:** Cliff  Bartley → No. 9; 1991-04-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Randy  Gilkerson et al → No. 9; 1992-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Ember Contracting, Inc. → No. 9; 2002-05-12 to 2005-05-25; source msha-controller-operator-history
- **controller_controls_operator:** Randy  Gilkerson et al → Ember Contracting, Inc.; 2002-05-12 to 2005-05-25; source msha-controller-operator-history
- **operator_operates_mine:** Cliffco Enterprise, Inc. → No. 9; 2005-05-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cliff  Bartley → Cliffco Enterprise, Inc.; 2005-05-26 to current/open; source msha-controller-operator-history