# Relationship history for MSHA mine 0404911

Current hierarchy: **Trans Waterways Usa Inc → Trans Waterways Usa Inc → Sunnyside Mine (Lee Marvin Drift)**

- 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:** Trans Waterways Usa Inc → Sunnyside Mine (Lee Marvin Drift); 1987-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Trans Waterways Usa Inc → Sunnyside Mine (Lee Marvin Drift); 1987-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Trans Waterways Usa Inc → Trans Waterways Usa Inc; 1987-11-01 to current/open; source msha-controller-operator-history