# Relationship history for MSHA mine 2602804

Current hierarchy: **Tom  Toronto → Tom Toronto → Blue Ridge Mine**

- 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:** Tom Toronto → Blue Ridge Mine; 2016-10-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Tom  Toronto → Blue Ridge Mine; 2016-10-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tom  Toronto → Tom Toronto; 2016-10-24 to current/open; source msha-controller-operator-history