# Relationship history for MSHA mine 1400001

Current hierarchy: **Allen County-KS → Allen County Quarry → Allen County 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Allen County Quarry → Allen County Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Allen County-KS → Allen County Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Allen County-KS → Allen County Quarry; 1950-01-01 to current/open; source msha-controller-operator-history