# Relationship history for MSHA mine 1102443

Current hierarchy: **Castellana R K → Illinois Coal Oil & Gas Company → No 1 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:** Illinois Coal Oil & Gas Company → No 1 Strip; 1976-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Castellana R K → No 1 Strip; 1976-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Castellana R K → Illinois Coal Oil & Gas Company; 1976-02-01 to current/open; source msha-controller-operator-history