# Relationship history for MSHA mine 2801005

Current hierarchy: **William  Clayton → Clayton Sand Co, LLC → Clayton Sand-Lacey 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

- **operator_operates_mine:** Central Concrete Aggregates → Clayton Sand-Lacey Plant; 1999-10-01 to 2002-06-21; source msha-controller-operator-history
- **controller_controls_mine:** Nelson  Walling → Clayton Sand-Lacey Plant; 1999-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Nelson  Walling → Central Concrete Aggregates; 1999-10-01 to 2002-06-21; source msha-controller-operator-history
- **operator_operates_mine:** Clayton Sand Co, LLC → Clayton Sand-Lacey Plant; 2002-06-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** William  Clayton  et al → Clayton Sand-Lacey Plant; 2002-06-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William  Clayton  et al → Clayton Sand Co, LLC; 2002-06-22 to current/open; source msha-controller-operator-history