# Relationship history for MSHA mine 2301719

Current hierarchy: **Pike County-Mo → Pike County Highway Department → PORT. SCREENING 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

- **controller_controls_mine:** Pike County-Mo → PORT. SCREENING PLANT; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Pike County Highway Department → PORT. SCREENING PLANT; 1978-03-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Pike County-Mo → Pike County Highway Department; 1978-03-09 to current/open; source msha-controller-operator-history