# Relationship history for MSHA mine 3606166

Current hierarchy: **Ressler Walter → Walter Ressler → Jackson 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

- **controller_controls_mine:** Schafer George → Jackson Strip; 1976-05-13 to 1979-06-03; source msha-controller-operator-history
- **operator_operates_mine:** Vosco Inc → Jackson Strip; 1976-07-15 to 1977-08-15; source msha-controller-operator-history
- **controller_controls_operator:** Schafer George → Vosco Inc; 1976-07-15 to 1977-08-15; source msha-controller-operator-history
- **operator_operates_mine:** Walter Ressler → Jackson Strip; 1977-08-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ressler Walter → Jackson Strip; 1977-08-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ressler Walter → Walter Ressler; 1977-08-16 to current/open; source msha-controller-operator-history