# Relationship history for MSHA mine 1516145

Current hierarchy: **Phipps Ray Scott → Phipps Mining Company → #2 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

- **controller_controls_mine:** Phipps Ray Scott Et Al → #2 Mine; 1983-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Phipps Mining Company → #2 Mine; 1987-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Phipps Ray Scott Et Al → Phipps Mining Company; 1987-08-01 to current/open; source msha-controller-operator-history