# Relationship history for MSHA mine 0504856

Current hierarchy: **Donald O  Rooks Jr → Ace West Trucking → Kenny Pit Portable 1**

- 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:** Donald O  Rooks Jr → Kenny Pit Portable 1; 1999-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Ace West Trucking → Kenny Pit Portable 1; 2006-09-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Donald O  Rooks Jr → Ace West Trucking; 2006-09-13 to current/open; source msha-controller-operator-history