# Relationship history for MSHA mine 6600018

Current hierarchy: **Albert & Shayne Smith Australia Family Trust → Smithbridge Guam Inc. → Smithbridge Guam Inc.**

- 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:** Smithbridge Guam Inc. → Smithbridge Guam Inc.; 2016-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Albert & Shayne Smith Australia Family Trust → Smithbridge Guam Inc.; 2016-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Albert & Shayne Smith Australia Family Trust → Smithbridge Guam Inc.; 2016-09-01 to current/open; source msha-controller-operator-history