# Relationship history for MSHA mine 4202351

Current hierarchy: **James E  Robinson → J. R. Ready Mix, Inc. → J. R. Ready Mix  Blue Mtn. Plnt**

- 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:** James E  Robinson → J. R. Ready Mix  Blue Mtn. Plnt; 1984-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** J. R. Ready Mix, Inc. → J. R. Ready Mix  Blue Mtn. Plnt; 2002-05-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James E  Robinson → J. R. Ready Mix, Inc.; 2002-05-21 to current/open; source msha-controller-operator-history