# Relationship history for MSHA mine 1517066

Current hierarchy: **Milford  Compton; Herstel  Ratliff → Top Gun Coal Company Inc → #4 Mine**

- 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:** Milford  Compton et al → #4 Mine; 1987-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Top Gun Coal Company Inc → #4 Mine; 1991-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Milford  Compton et al → Top Gun Coal Company Inc; 1991-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Herstel  Ratliff et al → Top Gun Coal Company Inc; 1991-04-01 to current/open; source msha-controller-operator-history