# Relationship history for MSHA mine 1509715

Current hierarchy: **Morta Ralph Della → Captina Mining Inc → 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

- **controller_controls_mine:** Morta Ralph Della → No 1 Strip; 1974-09-02 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Captina Mining Inc → No 1 Strip; 1976-03-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Morta Ralph Della → Captina Mining Inc; 1976-03-24 to current/open; source msha-controller-operator-history