# Relationship history for MSHA mine 3003523

Current hierarchy: **F Lincoln  Walkley → West Wind Aggregates → West Wind**

- 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

- **controller_controls_mine:** F Lincoln  Walkley → West Wind; 1991-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** West Wind Aggregates → West Wind; 2005-10-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** F Lincoln  Walkley → West Wind Aggregates; 2005-10-13 to current/open; source msha-controller-operator-history