# Relationship history for MSHA mine 0405461

Current hierarchy: **Leland  Rock → Rock & Gadberry Gravel → LELAND ROCK 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:** Rock & Gadberry Gravel → LELAND ROCK MINE; 2000-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Leland  Rock → LELAND ROCK MINE; 2000-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Leland  Rock → Rock & Gadberry Gravel; 2000-10-01 to current/open; source msha-controller-operator-history