# Relationship history for MSHA mine 4202629

Current hierarchy: **Darin J  Christensen → christensen ready mix → south town**

- 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:** Darin J  Christensen → south town; 2000-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** christensen ready mix → south town; 2014-04-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Darin J  Christensen → christensen ready mix; 2014-04-30 to current/open; source msha-controller-operator-history