# Relationship history for MSHA mine 0202701

Current hierarchy: **Frances F  Dunbar → Dunbar Stone Company Inc → Hualapai Chocolate**

- 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:** Dunbar Stone Company Inc → Hualapai Chocolate; 1997-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Frances F  Dunbar  et al → Hualapai Chocolate; 1997-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Frances F  Dunbar  et al → Dunbar Stone Company Inc; 1997-07-01 to current/open; source msha-controller-operator-history