# Relationship history for MSHA mine 1200942

Current hierarchy: **Will Gene C → Will Construction Company Inc → Will Coal Mine No 1 (Millersburg Pit)**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** L G Wasson Coal Mining Corp → Will Coal Mine No 1 (Millersburg Pit); 1950-01-01 to 1979-01-17; source msha-controller-operator-history
- **controller_controls_mine:** Wasson L G → Will Coal Mine No 1 (Millersburg Pit); 1950-01-01 to 1979-01-17; source msha-controller-operator-history
- **controller_controls_operator:** Wasson L G → L G Wasson Coal Mining Corp; 1950-01-01 to 1979-01-17; source msha-controller-operator-history
- **controller_controls_mine:** Will Gene C Et Al → Will Coal Mine No 1 (Millersburg Pit); 1975-08-12 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Will Construction Company Inc → Will Coal Mine No 1 (Millersburg Pit); 1979-01-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Will Gene C Et Al → Will Construction Company Inc; 1979-01-18 to current/open; source msha-controller-operator-history