# Relationship history for MSHA mine 3602770

Current hierarchy: **Lehman Allen R → S C Mining Company Inc → Pot Ridge Strip**

- 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:** S C Mining Company Inc → Pot Ridge Strip; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lehman Allen R → Pot Ridge Strip; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lehman Allen R → S C Mining Company Inc; 1950-01-01 to current/open; source msha-controller-operator-history