# Relationship history for MSHA mine 3607197

Current hierarchy: **Stiffler Albert F & Albert L → Eastern States Mining Company → Barger Strip**

- 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:** Eastern States Mining Company → Barger Strip; 1981-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Stiffler Albert F & Albert L → Barger Strip; 1981-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stiffler Albert F & Albert L → Eastern States Mining Company; 1981-08-01 to current/open; source msha-controller-operator-history