# Relationship history for MSHA mine 4801421

Current hierarchy: **Steve  Loftin → 71 Construction → Kolberg Portable Screen**

- 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:** 71 Construction → Kolberg Portable Screen; 1985-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Steve  Loftin → Kolberg Portable Screen; 1985-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Steve  Loftin → 71 Construction; 1985-01-01 to current/open; source msha-controller-operator-history