# Relationship history for MSHA mine 4607887

Current hierarchy: **Edward A  Asbury → Timco Energy Inc → Mine No 4**

- 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:** Dillon Samuel E → Mine No 4; 1986-04-11 to 2001-05-21; source msha-controller-operator-history
- **controller_controls_mine:** Edward A  Asbury → Mine No 4; 1987-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** J J & S Coal Corp → Mine No 4; 1990-05-01 to 2001-05-21; source msha-controller-operator-history
- **controller_controls_operator:** Dillon Samuel E → J J & S Coal Corp; 1990-05-01 to 2001-05-21; source msha-controller-operator-history
- **operator_operates_mine:** Timco Energy Inc → Mine No 4; 2001-05-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Edward A  Asbury → Timco Energy Inc; 2001-05-22 to current/open; source msha-controller-operator-history