# Relationship history for MSHA mine 4104727

Current hierarchy: **Dean L  Buchanan → Patterson Creek Quarry → Patterson Portable #1**

- 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:** Patterson Creek Quarry → Patterson Portable #1; 2008-04-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Dean L  Buchanan → Patterson Portable #1; 2008-04-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dean L  Buchanan → Patterson Creek Quarry; 2008-04-22 to current/open; source msha-controller-operator-history