# Relationship history for MSHA mine 4503081

Current hierarchy: **Van Eaton James P → Van Eaton & Daniel Crushing Company Inc → Portable Rock Crusher**

- 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:** Van Eaton & Daniel Crushing Company Inc → Portable Rock Crusher; 1986-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Van Eaton James P → Portable Rock Crusher; 1986-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Van Eaton James P → Van Eaton & Daniel Crushing Company Inc; 1986-05-01 to current/open; source msha-controller-operator-history