# Relationship history for MSHA mine 3503619

Current hierarchy: **Chris  Galpin; John  Holmes → Southern Oregon Rock → Plant #3**

- 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

- **controller_controls_mine:** John  Holmes et al → Plant #3; 2001-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Southern Oregon Rock → Plant #3; 2005-06-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John  Holmes et al → Southern Oregon Rock; 2005-06-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Chris  Galpin et al → Southern Oregon Rock; 2005-06-15 to current/open; source msha-controller-operator-history