# Relationship history for MSHA mine 1507145

Current hierarchy: **Mallas Jim G → Omega Energy Inc → No 1 Surface**

- 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

- **operator_operates_mine:** A C Coal Company Inc → No 1 Surface; 1975-01-01 to 1978-03-19; source msha-controller-operator-history
- **controller_controls_mine:** Carpenter C M → No 1 Surface; 1975-01-01 to 1978-03-19; source msha-controller-operator-history
- **controller_controls_operator:** Carpenter C M → A C Coal Company Inc; 1975-01-01 to 1978-03-19; source msha-controller-operator-history
- **operator_operates_mine:** Omega Energy Inc → No 1 Surface; 1978-03-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mallas Jim G → No 1 Surface; 1978-03-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mallas Jim G → Omega Energy Inc; 1978-03-20 to current/open; source msha-controller-operator-history