# Relationship history for MSHA mine 3301609

Current hierarchy: **Olen Corporation → The Olen Corporation → Wooster 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Prairie Lane Corp → Wooster Plant; 1950-01-01 to 2004-06-20; source msha-controller-operator-history
- **controller_controls_mine:** Ralph W Miller → Wooster Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ralph W Miller → Prairie Lane Corp; 1950-01-01 to 2004-06-20; source msha-controller-operator-history
- **controller_controls_mine:** Olen Corporation → Wooster Plant; 1983-05-31 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Wooster Aggregates, LLC → Wooster Plant; 2004-06-21 to 2008-04-01; source msha-controller-operator-history
- **controller_controls_mine:** Olen Corporation → Wooster Plant; 2004-06-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Olen Corporation → Wooster Aggregates, LLC; 2004-06-21 to 2008-04-01; source msha-controller-operator-history
- **operator_operates_mine:** The Olen Corporation → Wooster Plant; 2008-04-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Olen Corporation → The Olen Corporation; 2008-04-02 to current/open; source msha-controller-operator-history