# Relationship history for MSHA mine 4703075

Current hierarchy: **Pavement Materials LLC → Todd's Redi-Mix Concrete, LLC → Plant 6 (Portable Wash 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: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Neeck Concrete Products, LLC → Plant 6 (Portable Wash Plant); 1996-06-01 to 2008-11-30; source msha-controller-operator-history
- **controller_controls_mine:** Donald C Neeck et al → Plant 6 (Portable Wash Plant); 1996-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Donald C Neeck et al → Neeck Concrete Products, LLC; 1996-06-01 to 2008-11-30; source msha-controller-operator-history
- **controller_controls_operator:** Howard H Neeck et al → Neeck Concrete Products, LLC; 1996-06-01 to 2008-11-30; source msha-controller-operator-history
- **controller_controls_mine:** Paul T  Ayres → Plant 6 (Portable Wash Plant); 1998-06-09 to 2004-10-31; source msha-controller-operator-history
- **controller_controls_mine:** Pavement Materials LLC → Plant 6 (Portable Wash Plant); 2004-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Todd's Redi-Mix Concrete, LLC → Plant 6 (Portable Wash Plant); 2008-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Pavement Materials LLC → Todd's Redi-Mix Concrete, LLC; 2008-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Paul T  Ayres → Todd's Redi-Mix Concrete, LLC; 2008-12-01 to 2004-10-31; source msha-controller-operator-history