# Relationship history for MSHA mine 0504869

Current hierarchy: **Las Animas County-CO → Las Animas County Government → Portable Screen 12207**

- 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

- **controller_controls_mine:** Las Animas County-CO → Portable Screen 12207; 1993-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Las Animas County Government → Portable Screen 12207; 2007-04-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Las Animas County-CO → Las Animas County Government; 2007-04-20 to current/open; source msha-controller-operator-history