# Relationship history for MSHA mine 0504765

Current hierarchy: **Baca County-CO → Baca County District II → Baca Co Portable Crusher**

- 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

- **controller_controls_mine:** Baca County-CO → Baca Co Portable Crusher; 1992-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Baca County Court House → Baca Co Portable Crusher; 2003-03-31 to 2003-08-24; source msha-controller-operator-history
- **controller_controls_mine:** Baca County-CO → Baca Co Portable Crusher; 2003-03-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Baca County-CO → Baca County Court House; 2003-03-31 to 2003-08-24; source msha-controller-operator-history
- **operator_operates_mine:** Baca County District II → Baca Co Portable Crusher; 2003-08-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Baca County-CO → Baca County District II; 2003-08-25 to current/open; source msha-controller-operator-history