# Relationship history for MSHA mine 1302462

Current hierarchy: **Michael R  Sjoblom → Michaelson Inc → 271 Plant**

- 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:** Michael R  Sjoblom → 271 Plant; 2003-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Michaelson Inc → 271 Plant; 2017-03-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael R  Sjoblom → Michaelson Inc; 2017-03-20 to current/open; source msha-controller-operator-history