# Relationship history for MSHA mine 1000886

Current hierarchy: **Kirk  Burns → Burns Concrete Inc → Portable Crushing Plant**

- 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:** Burns Brothers Concrete Products Inc → Portable Crushing Plant; 1950-01-01 to 1993-10-13; source msha-controller-operator-history
- **controller_controls_mine:** B Owen  Burns → Portable Crushing Plant; 1950-01-01 to 1993-10-13; source msha-controller-operator-history
- **controller_controls_operator:** B Owen  Burns → Burns Brothers Concrete Products Inc; 1950-01-01 to 1993-10-13; source msha-controller-operator-history
- **operator_operates_mine:** Burns Concrete Inc → Portable Crushing Plant; 1993-10-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kirk  Burns → Portable Crushing Plant; 1993-10-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kirk  Burns → Burns Concrete Inc; 1993-10-14 to current/open; source msha-controller-operator-history