# Relationship history for MSHA mine 4703203

Current hierarchy: **William E  Kennedy → Rock Road Companies, Inc. → Portable Wash Plant 70.01**

- 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:** William E  Kennedy → Portable Wash Plant 70.01; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Rock Road Companies, Inc. → Portable Wash Plant 70.01; 1999-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William E  Kennedy → Rock Road Companies, Inc.; 1999-06-01 to current/open; source msha-controller-operator-history