# Relationship history for MSHA mine 1512612

Current hierarchy: **Allen G  Stump → Stemco Coal Company Inc → 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:** Stemco Coal Company Inc → No 1 Mine (D); 1980-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Allen G  Stump et al → No 1 Mine (D); 1980-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Allen G  Stump et al → Stemco Coal Company Inc; 1980-11-01 to current/open; source msha-controller-operator-history