# Relationship history for MSHA mine 3607522

Current hierarchy: **Waldermar T  Fetterolf Jr → Homestead Mining Company → No 1 Drift**

- 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:** Homestead Mining Company → No 1 Drift; 1984-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Waldermar T  Fetterolf Jr et al → No 1 Drift; 1984-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Waldermar T  Fetterolf Jr et al → Homestead Mining Company; 1984-01-01 to current/open; source msha-controller-operator-history