# Relationship history for MSHA mine 2103426

Current hierarchy: **Roger W  Alajoki; Philip J  Alajoki → Alajoki Sand & Gravel, Inc. → Alajoki Pit**

- 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

- **operator_operates_mine:** Alajoki Sand & Gravel, Inc. → Alajoki Pit; 2004-05-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Roger W  Alajoki et al → Alajoki Pit; 2004-05-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Roger W  Alajoki et al → Alajoki Sand & Gravel, Inc.; 2004-05-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Philip J  Alajoki et al → Alajoki Sand & Gravel, Inc.; 2004-05-19 to current/open; source msha-controller-operator-history