# Relationship history for MSHA mine 0504035

Current hierarchy: **Weld County-Co → Weld County Road & Bridge Department → Geisert Pit**

- 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:** Weld County-Co → Geisert Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Weld County Road & Bridge Department → Geisert Pit; 1985-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Weld County-Co → Weld County Road & Bridge Department; 1985-05-01 to current/open; source msha-controller-operator-history