# Relationship history for MSHA mine 2402284

Current hierarchy: **Robert P  Orr → R P O Stone Inc → Surprise Hill**

- 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 Of Ages Stone → Surprise Hill; 2002-05-10 to 2005-10-31; source msha-controller-operator-history
- **controller_controls_mine:** Robert P  Orr → Surprise Hill; 2002-05-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert P  Orr → Rock Of Ages Stone; 2002-05-10 to 2005-10-31; source msha-controller-operator-history
- **operator_operates_mine:** R P O Stone Inc → Surprise Hill; 2005-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Robert P  Orr → Surprise Hill; 2005-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert P  Orr → R P O Stone Inc; 2005-11-01 to current/open; source msha-controller-operator-history