# Relationship history for MSHA mine 1518411

Current hierarchy: **Cliff  Bartley → Cliffco Enterprise, Inc. → No. 6**

- 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:** Rex  Fought → No. 6; 1987-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cliff  Bartley → No. 6; 1991-04-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Donna L  Johnson → No. 6; 1999-08-27 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Sheep Fork Energy Inc → No. 6; 2001-07-01 to 2001-10-25; source msha-controller-operator-history
- **controller_controls_operator:** Rex  Fought → Sheep Fork Energy Inc; 2001-07-01 to 2001-10-25; source msha-controller-operator-history
- **operator_operates_mine:** Diamond Star Mining, Inc. → No. 6; 2001-10-26 to 2002-07-18; source msha-controller-operator-history
- **controller_controls_operator:** Donna L  Johnson → Diamond Star Mining, Inc.; 2001-10-26 to 2002-07-18; source msha-controller-operator-history
- **operator_operates_mine:** Cliffco Enterprise, Inc. → No. 6; 2002-07-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cliff  Bartley → Cliffco Enterprise, Inc.; 2002-07-19 to current/open; source msha-controller-operator-history