# Relationship history for MSHA mine 4503383

Current hierarchy: **Corey L  Johnson; William L  Massey → Willard Aggregates → WILLARD AGGREGATES**

- 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:** Willard Aggregates → WILLARD AGGREGATES; 1999-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** William L  Massey et al → WILLARD AGGREGATES; 1999-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William L  Massey et al → Willard Aggregates; 1999-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Corey L  Johnson et al → Willard Aggregates; 1999-01-01 to current/open; source msha-controller-operator-history