# Relationship history for MSHA mine 1512646

Current hierarchy: **Adkins Lowell B → M A C Coal Enterprises Inc → No 3 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:** Adkins Lowell B → No 3 Mine; 1979-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Webb George D → No 3 Mine; 1980-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Sawgrass Coal Company Inc → No 3 Mine; 1980-11-01 to 1981-05-17; source msha-controller-operator-history
- **controller_controls_operator:** Webb George D → Sawgrass Coal Company Inc; 1980-11-01 to 1981-05-17; source msha-controller-operator-history
- **operator_operates_mine:** M A C Coal Enterprises Inc → No 3 Mine; 1981-05-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Adkins Lowell B → M A C Coal Enterprises Inc; 1981-05-18 to current/open; source msha-controller-operator-history