# Relationship history for MSHA mine 2402276

Current hierarchy: **William E  Fish → Robin Rock Works → Robin Rock Works**

- 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:** Robin Rock Works → Robin Rock Works; 2002-04-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** William E  Fish → Robin Rock Works; 2002-04-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William E  Fish → Robin Rock Works; 2002-04-24 to current/open; source msha-controller-operator-history