# Relationship history for MSHA mine 1517029

Current hierarchy: **Mullins Kash → Kashcoal Inc → Della D Mine**

- 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:** Kashcoal Inc → Della D Mine; 1990-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mullins Kash Et Al → Della D Mine; 1990-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mullins Kash Et Al → Kashcoal Inc; 1990-12-01 to current/open; source msha-controller-operator-history