# Relationship history for MSHA mine 6900009

Current hierarchy: **Hang  Cheing Tan → GPPC, INC → CROSS ISLAND ROAD**

- 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

- **controller_controls_mine:** Hang  Cheing Tan → CROSS ISLAND ROAD; 2016-04-07 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** GPPC, INC → CROSS ISLAND ROAD; 2016-10-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hang  Cheing Tan → GPPC, INC; 2016-10-24 to current/open; source msha-controller-operator-history