# Relationship history for MSHA mine 3301446

Current hierarchy: **Olen Corporation → The Olen Corporation → Hilliard 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:** Olen Corp → Hilliard Plant; 1950-01-01 to 1983-05-30; source msha-controller-operator-history
- **controller_controls_mine:** John C Antrim → Hilliard Plant; 1950-01-01 to 1983-05-30; source msha-controller-operator-history
- **controller_controls_operator:** John C Antrim → Olen Corp; 1950-01-01 to 1983-05-30; source msha-controller-operator-history
- **operator_operates_mine:** The Olen Corporation → Hilliard Plant; 1983-05-31 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Olen Corporation → Hilliard Plant; 1983-05-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Olen Corporation → The Olen Corporation; 1983-05-31 to current/open; source msha-controller-operator-history