# Relationship history for MSHA mine 5100284

Current hierarchy: **Hiroshi H  Park → Seacon Tech Corp. → Portable Plant #1**

- 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:** Seacon Tech Corp. → Portable Plant #1; 2008-03-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hiroshi H  Park → Portable Plant #1; 2008-03-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hiroshi H  Park → Seacon Tech Corp.; 2008-03-24 to current/open; source msha-controller-operator-history