# Relationship history for MSHA mine 1800654

Current hierarchy: **Sincs Joseph → Dodge City Coal Inc → 4-S Surface**

- 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:** Dodge City Coal Inc → 4-S Surface; 1977-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Sincs Joseph → 4-S Surface; 1977-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sincs Joseph → Dodge City Coal Inc; 1977-10-01 to current/open; source msha-controller-operator-history