# Relationship history for MSHA mine 6900008

Current hierarchy: **Hang  Cheing Tan → GPPC, Inc → Rota GPPC 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

- **controller_controls_mine:** Hang  Cheing Tan → Rota GPPC Quarry; 2016-04-07 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** GPPC, Inc → Rota GPPC Quarry; 2016-06-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hang  Cheing Tan → GPPC, Inc; 2016-06-13 to current/open; source msha-controller-operator-history