# Relationship history for MSHA mine 4606387

Current hierarchy: **Jeff  Chillag → Dairy Hollow Robin Coal Company Inc → Dairy Hollow Robin Coal Company Inc**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Dairy Hollow Robin Coal Company Inc → Dairy Hollow Robin Coal Company Inc; 1981-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jeff  Chillag et al → Dairy Hollow Robin Coal Company Inc; 1981-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jeff  Chillag et al → Dairy Hollow Robin Coal Company Inc; 1981-09-01 to current/open; source msha-controller-operator-history