# Relationship history for MSHA mine 0504243

Current hierarchy: **Dovel Rocky → R & R Stone → R & R Stone**

- 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:** Dovel Stone → R & R Stone; 1987-07-01 to 1991-07-01; source msha-controller-operator-history
- **controller_controls_mine:** Dovel Barry → R & R Stone; 1987-07-01 to 1991-07-01; source msha-controller-operator-history
- **controller_controls_operator:** Dovel Barry → Dovel Stone; 1987-07-01 to 1991-07-01; source msha-controller-operator-history
- **operator_operates_mine:** R & R Stone → R & R Stone; 1991-07-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Dovel Rocky → R & R Stone; 1991-07-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dovel Rocky → R & R Stone; 1991-07-02 to current/open; source msha-controller-operator-history