# Relationship history for MSHA mine 4607170

Current hierarchy: **Maplewood Mining Company Inc → Maplewood Mining Company Inc → Maplewood No 4 (Surface)**

- 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:** Maplewood Mining Company Inc → Maplewood No 4 (Surface); 1984-02-07 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Maplewood Mining Company Inc → Maplewood No 4 (Surface); 1986-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Maplewood Mining Company Inc → Maplewood Mining Company Inc; 1986-08-01 to current/open; source msha-controller-operator-history