# Relationship history for MSHA mine 0504378

Current hierarchy: **Colorado School Of Mines → Csm Mining Engineering Department → Clear Creek Cave**

- 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

- **operator_operates_mine:** Csm Mining Engineering Department → Clear Creek Cave; 1988-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Colorado School Of Mines → Clear Creek Cave; 1988-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Colorado School Of Mines → Csm Mining Engineering Department; 1988-11-01 to current/open; source msha-controller-operator-history