# Relationship history for MSHA mine 4202803

Current hierarchy: **Byron  Stubbs → Byron Stubbs → Iron Springs**

- 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:** Byron Stubbs → Iron Springs; 2026-03-31 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Byron  Stubbs → Iron Springs; 2026-03-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Byron  Stubbs → Byron Stubbs; 2026-03-31 to current/open; source msha-controller-operator-history