# Relationship history for MSHA mine 3003860

Current hierarchy: **Charles A  Humphrey Jr → Charles Humphrey Jr → River Road Gravel Pit**

- 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:** Charles Humphrey Jr → River Road Gravel Pit; 2012-09-17 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Charles A  Humphrey Jr → River Road Gravel Pit; 2012-09-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Charles A  Humphrey Jr → Charles Humphrey Jr; 2012-09-17 to current/open; source msha-controller-operator-history