# Relationship history for MSHA mine 1001647

Current hierarchy: **Brian L  Wood → Wood's Crushing & Hauling Inc → Portable Crusher**

- 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:** Wood's Crushing & Hauling Inc → Portable Crusher; 1984-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Brian L  Wood → Portable Crusher; 1984-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brian L  Wood → Wood's Crushing & Hauling Inc; 1984-07-01 to current/open; source msha-controller-operator-history