# Relationship history for MSHA mine 1517300

Current hierarchy: **Gray Dennis → Headache Coal Company Inc → #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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Gray Dennis → #1; 1992-01-22 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Headache Coal Company Inc → #1; 1992-08-01 to 1994-09-25; source msha-controller-operator-history
- **controller_controls_operator:** Gray Dennis → Headache Coal Company Inc; 1992-08-01 to 1994-09-25; source msha-controller-operator-history
- **operator_operates_mine:** Flat Broke Coal Company Inc → #1; 1994-09-26 to 1995-08-29; source msha-controller-operator-history
- **controller_controls_mine:** Logan Greg → #1; 1994-09-26 to 1995-08-29; source msha-controller-operator-history
- **controller_controls_operator:** Logan Greg → Flat Broke Coal Company Inc; 1994-09-26 to 1995-08-29; source msha-controller-operator-history
- **operator_operates_mine:** Headache Coal Company Inc → #1; 1995-08-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gray Dennis → Headache Coal Company Inc; 1995-08-30 to current/open; source msha-controller-operator-history