# Relationship history for MSHA mine 2301764

Current hierarchy: **Robert O  Yows → Robert O Yows → ROBERT O YOWS**

- 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:** Emmett W  Dunstan → ROBERT O YOWS; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Dunstan & Yows Inc → ROBERT O YOWS; 1979-01-01 to 1996-04-24; source msha-controller-operator-history
- **controller_controls_operator:** Emmett W  Dunstan → Dunstan & Yows Inc; 1979-01-01 to 1996-04-24; source msha-controller-operator-history
- **operator_operates_mine:** Robert O Yows → ROBERT O YOWS; 1996-04-25 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Robert O  Yows → ROBERT O YOWS; 1996-04-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert O  Yows → Robert O Yows; 1996-04-25 to current/open; source msha-controller-operator-history