# Relationship history for MSHA mine 2003333

Current hierarchy: **Daniel B  Mathews → H C Mathews Gravel → Lake 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:** H C Mathews Gravel → Lake Road Gravel Pit; 2005-10-13 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Daniel B  Mathews → Lake Road Gravel Pit; 2005-10-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Daniel B  Mathews → H C Mathews Gravel; 2005-10-13 to current/open; source msha-controller-operator-history