# Relationship history for MSHA mine 3004000

Current hierarchy: **Thomas A  Morgan → Morgan Logging & Firewood → Wixson Sand & Gravel**

- 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:** Thomas A  Morgan → Wixson Sand & Gravel; 1999-12-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Morgan Logging & Firewood → Wixson Sand & Gravel; 2017-08-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thomas A  Morgan → Morgan Logging & Firewood; 2017-08-29 to current/open; source msha-controller-operator-history