# Relationship history for MSHA mine 0504650

Current hierarchy: **Donald O  Rooks Jr → Ace West Trucking → RANGELY PIT**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Ace West Trucking → RANGELY PIT; 1999-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Donald O  Rooks Jr → RANGELY PIT; 1999-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Donald O  Rooks Jr → Ace West Trucking; 1999-07-01 to current/open; source msha-controller-operator-history