# Relationship history for MSHA mine 5001858

Current hierarchy: **Hitoshi  Yasumatsu → Nippo/IBC → Anvik Rock Quarry**

- 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:** Nippo/IBC → Anvik Rock Quarry; 2007-02-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hitoshi  Yasumatsu → Anvik Rock Quarry; 2007-02-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hitoshi  Yasumatsu → Nippo/IBC; 2007-02-14 to current/open; source msha-controller-operator-history