# Relationship history for MSHA mine 3201090

Current hierarchy: **Andy  Brown → Blue Butte Aggragates → Blue Butte Sivertson scoria pit**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **controller_controls_mine:** Andy  Brown → Blue Butte Sivertson scoria pit; 2020-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Blue Butte Aggragates → Blue Butte Sivertson scoria pit; 2024-03-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Andy  Brown → Blue Butte Aggragates; 2024-03-18 to current/open; source msha-controller-operator-history