# Relationship history for MSHA mine 4003155

Current hierarchy: **Koester Companies Inc → Southwind Construction Corp → SOUTHWIND-NASHVILLE SPEEDWAY**

- 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:** Southwind Construction Corp → SOUTHWIND-NASHVILLE SPEEDWAY; 2000-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Koester Companies Inc → SOUTHWIND-NASHVILLE SPEEDWAY; 2000-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Koester Companies Inc → Southwind Construction Corp; 2000-02-01 to current/open; source msha-controller-operator-history