# Relationship history for MSHA mine 1505224

Current hierarchy: **Mc Ghee Jack → Hyde & Mc Ghee Coal Company Inc → No 1 Strip**

- 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

- **operator_operates_mine:** Goff Coal Co → No 1 Strip; 1950-01-01 to 1973-09-26; source msha-controller-operator-history
- **controller_controls_mine:** Goff Jack → No 1 Strip; 1950-01-01 to 1973-09-26; source msha-controller-operator-history
- **controller_controls_operator:** Goff Jack → Goff Coal Co; 1950-01-01 to 1973-09-26; source msha-controller-operator-history
- **operator_operates_mine:** Hyde & Mc Ghee Coal Company Inc → No 1 Strip; 1973-09-27 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mc Ghee Jack → No 1 Strip; 1973-09-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mc Ghee Jack → Hyde & Mc Ghee Coal Company Inc; 1973-09-27 to current/open; source msha-controller-operator-history