# Relationship history for MSHA mine 3900458

Current hierarchy: **Ronald D  Van Zee → Van Zee Gravel & Construction Inc → Van Zee 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:** Marvin Vanzee Trucking Inc → Van Zee Gravel Pit; 1950-01-01 to 1994-08-14; source msha-controller-operator-history
- **controller_controls_mine:** Martin  Van Zee → Van Zee Gravel Pit; 1950-01-01 to 1994-08-14; source msha-controller-operator-history
- **controller_controls_operator:** Martin  Van Zee → Marvin Vanzee Trucking Inc; 1950-01-01 to 1994-08-14; source msha-controller-operator-history
- **operator_operates_mine:** Van Zee Gravel & Construction Inc → Van Zee Gravel Pit; 1994-08-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ronald D  Van Zee → Van Zee Gravel Pit; 1994-08-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ronald D  Van Zee → Van Zee Gravel & Construction Inc; 1994-08-15 to current/open; source msha-controller-operator-history