# Relationship history for MSHA mine 1001909

Current hierarchy: **Madison County-Id → Madison County Road Department → Portable Plant #One**

- 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:** Madison County Road Department → Portable Plant #One; 1994-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Madison County-Id → Portable Plant #One; 1994-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Madison County-Id → Madison County Road Department; 1994-09-01 to current/open; source msha-controller-operator-history