# Relationship history for MSHA mine 4703511

Current hierarchy: **Pavement Materials LLC → Todds Redi-Mix Concrete LLC → Plant 4 (Portable Rip-Rap Plant)**

- 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

- **controller_controls_mine:** Paul T  Ayres → Plant 4 (Portable Rip-Rap Plant); 1998-06-09 to 2004-10-31; source msha-controller-operator-history
- **controller_controls_mine:** Pavement Materials LLC → Plant 4 (Portable Rip-Rap Plant); 2004-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Todds Redi-Mix Concrete LLC → Plant 4 (Portable Rip-Rap Plant); 2007-09-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Pavement Materials LLC → Todds Redi-Mix Concrete LLC; 2007-09-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Paul T  Ayres → Todds Redi-Mix Concrete LLC; 2007-09-19 to 2004-10-31; source msha-controller-operator-history