# Relationship history for MSHA mine 3503836

Current hierarchy: **John  Root; Scott  Andrews → central oregon basalt products llc → old maids canyon 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** central oregon basalt products llc → old maids canyon quarry; 2015-08-18 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Scott  Andrews et al → old maids canyon quarry; 2015-08-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Scott  Andrews et al → central oregon basalt products llc; 2015-08-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John  Root et al → central oregon basalt products llc; 2015-08-18 to current/open; source msha-controller-operator-history