# Relationship history for MSHA mine 4801798

Current hierarchy: **Converse County-WY → Converse County Road & Bridge → Dry Creek Gravel 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Converse County-WY → Dry Creek Gravel Pit; 2004-03-03 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Converse County Road & Bridge → Dry Creek Gravel Pit; 2016-01-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Converse County-WY → Converse County Road & Bridge; 2016-01-28 to current/open; source msha-controller-operator-history