# Relationship history for MSHA mine 1501646

Current hierarchy: **Wellman Layton & Danny G Mullins → Lick Fork Elkhorn Coal Company → No 1 Mine (D)**

- 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:** Lick Fork Mining Company Inc → No 1 Mine (D); 1950-01-01 to 1982-11-09; source msha-controller-operator-history
- **controller_controls_mine:** Bartley Marvin → No 1 Mine (D); 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bartley Marvin → Lick Fork Mining Company Inc; 1950-01-01 to 1982-11-09; source msha-controller-operator-history
- **operator_operates_mine:** Lick Fork Elkhorn Coal Company → No 1 Mine (D); 1982-11-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Wellman Layton & Danny G Mullins → No 1 Mine (D); 1982-11-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wellman Layton & Danny G Mullins → Lick Fork Elkhorn Coal Company; 1982-11-10 to current/open; source msha-controller-operator-history