# Relationship history for MSHA mine 1509909

Current hierarchy: **Cornett Ellis → Age Coal Inc → Age No 7 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:** Cornett Ellis → Age No 7 Surface; 1975-07-27 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Age Coal Inc → Age No 7 Surface; 1976-08-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cornett Ellis → Age Coal Inc; 1976-08-17 to current/open; source msha-controller-operator-history