# Relationship history for MSHA mine 3303990

Current hierarchy: **Michael  Carlow → Midwest Portland Cement → Jonathan Limestone Mine**

- 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:** Midwest Portland Cement → Jonathan Limestone Mine; 1984-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Michael  Carlow  et al → Jonathan Limestone Mine; 1984-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael  Carlow  et al → Midwest Portland Cement; 1984-10-01 to current/open; source msha-controller-operator-history