# Relationship history for MSHA mine 2302220

Current hierarchy: **Louis S  Goltermann Jr → Alsey Refractories Company → ALSEY REFRACTORIES (PORTABLE)**

- 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:** Louis S  Goltermann Jr → ALSEY REFRACTORIES (PORTABLE); 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Alsey Refractories Company → ALSEY REFRACTORIES (PORTABLE); 2000-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Louis S  Goltermann Jr → Alsey Refractories Company; 2000-11-01 to current/open; source msha-controller-operator-history