# Relationship history for MSHA mine 2103826

Current hierarchy: **Jamie  Steffensen; Robert  Steffensen → Prairie Lakes Contracting LLC → Prairie Lake**

- 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:** Prairie Lakes Contracting LLC → Prairie Lake; 2014-05-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Robert  Steffensen et al → Prairie Lake; 2014-05-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert  Steffensen et al → Prairie Lakes Contracting LLC; 2014-05-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jamie  Steffensen et al → Prairie Lakes Contracting LLC; 2014-05-19 to current/open; source msha-controller-operator-history