# Relationship history for MSHA mine 3609434

Current hierarchy: **Sandra I  Wood; David P  Wood → Oak Ridge Bluestone → Wood's 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

- **controller_controls_mine:** David P  Wood et al → Wood's Quarry; 2005-06-25 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Oak Ridge Bluestone → Wood's Quarry; 2006-05-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David P  Wood et al → Oak Ridge Bluestone; 2006-05-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sandra I  Wood et al → Oak Ridge Bluestone; 2006-05-31 to current/open; source msha-controller-operator-history