# Relationship history for MSHA mine 0504682

Current hierarchy: **Clear Creek County-Co → Clear Creek County Road & Bridge Department → CLEAR CRK CTY PORTABLE SCREEN**

- 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:** Clear Creek County Road & Bridge Department → CLEAR CRK CTY PORTABLE SCREEN; 2000-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Clear Creek County-Co → CLEAR CRK CTY PORTABLE SCREEN; 2000-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Clear Creek County-Co → Clear Creek County Road & Bridge Department; 2000-06-01 to current/open; source msha-controller-operator-history