# Relationship history for MSHA mine 0405975

Current hierarchy: **John  Barella; Richard D  Powell; James  Ratto → Roblar Quarry LLC → Roblar Quarry LLC**

- 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:** Roblar Quarry LLC → Roblar Quarry LLC; 2023-12-31 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John  Barella et al → Roblar Quarry LLC; 2023-12-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John  Barella et al → Roblar Quarry LLC; 2023-12-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James  Ratto et al → Roblar Quarry LLC; 2023-12-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard D  Powell et al → Roblar Quarry LLC; 2023-12-31 to current/open; source msha-controller-operator-history