# Relationship history for MSHA mine 1512123

Current hierarchy: **Mullins George → G & M Coal Corp → No 1 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:** Howell Corporation → No 1 Mine; 1977-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Lake Coal Company Inc → No 1 Mine; 1979-11-01 to 1980-03-30; source msha-controller-operator-history
- **controller_controls_operator:** Howell Corporation → Lake Coal Company Inc; 1979-11-01 to 1980-03-30; source msha-controller-operator-history
- **operator_operates_mine:** G & M Coal Corp → No 1 Mine; 1980-03-31 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mullins George → No 1 Mine; 1980-03-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mullins George → G & M Coal Corp; 1980-03-31 to current/open; source msha-controller-operator-history