# Relationship history for MSHA mine 1516813

Current hierarchy: **Cliff  Bartley → Cliffco Enterprise Inc → No 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Thompson Benny → No 1; 1981-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** T & T Kentucky Coal Company Inc → No 1; 1990-01-01 to 1991-04-18; source msha-controller-operator-history
- **controller_controls_operator:** Thompson Benny → T & T Kentucky Coal Company Inc; 1990-01-01 to 1991-04-18; source msha-controller-operator-history
- **operator_operates_mine:** Cliffco Enterprise Inc → No 1; 1991-04-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cliff  Bartley → No 1; 1991-04-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cliff  Bartley → Cliffco Enterprise Inc; 1991-04-19 to current/open; source msha-controller-operator-history