# Relationship history for MSHA mine 0203274

Current hierarchy: **Victor  Byer; Mark  Willes → Sally-Mander Stone → Ash Fork Quarry**

- 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:** Sally-Mander Stone → Ash Fork Quarry; 2011-03-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mark  Willes et al → Ash Fork Quarry; 2011-03-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mark  Willes et al → Sally-Mander Stone; 2011-03-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Victor  Byer et al → Sally-Mander Stone; 2011-03-10 to current/open; source msha-controller-operator-history