# Relationship history for MSHA mine 3605892

Current hierarchy: **Shuttle A J Jr → Environmental Mining Company Inc → Toth 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:** Environmental Mining Company Inc → Toth Strip; 1975-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Shuttle A J Jr → Toth Strip; 1975-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Shuttle A J Jr → Environmental Mining Company Inc; 1975-06-01 to current/open; source msha-controller-operator-history