# Relationship history for MSHA mine 2003523

Current hierarchy: **Daniel C  Timmer → Riverfront Redi-Mix, Inc. → Screening Plant**

- 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:** Daniel C  Timmer et al → Screening Plant; 2003-04-30 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Riverfront Redi-Mix, Inc. → Screening Plant; 2015-10-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Daniel C  Timmer et al → Riverfront Redi-Mix, Inc.; 2015-10-30 to current/open; source msha-controller-operator-history