# Relationship history for MSHA mine 3402238

Current hierarchy: **Terry Lee  Nix → Oklahoma Natural Stone → The Ridge**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **controller_controls_mine:** Terry Lee  Nix et al → The Ridge; 2014-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Oklahoma Natural Stone → The Ridge; 2023-11-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Terry Lee  Nix et al → Oklahoma Natural Stone; 2023-11-27 to current/open; source msha-controller-operator-history