# Relationship history for MSHA mine 4801682

Current hierarchy: **Roy D  Emfinger → Circle D Gravel → Circle D Gravel D-1**

- 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:** Circle D Gravel → Circle D Gravel D-1; 2005-08-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Roy D  Emfinger → Circle D Gravel D-1; 2005-08-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Roy D  Emfinger → Circle D Gravel; 2005-08-02 to current/open; source msha-controller-operator-history