# Relationship history for MSHA mine 2103342

Current hierarchy: **Michael D Luukkonen → NTT of Minnesota Inc. → CECI-Roadrunner**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Michael D Luukkonen → CECI-Roadrunner; 1992-08-18 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** NTT of Minnesota Inc. → CECI-Roadrunner; 2003-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael D Luukkonen → NTT of Minnesota Inc.; 2003-04-01 to current/open; source msha-controller-operator-history