# Relationship history for MSHA mine 1512735

Current hierarchy: **Smith Kenny L → Phelps Mining Inc → No 3 (D)**

- 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:** Smith Kenny L → No 3 (D); 1975-11-02 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Phelps Mining Inc → No 3 (D); 1981-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Smith Kenny L → Phelps Mining Inc; 1981-02-01 to current/open; source msha-controller-operator-history