# Relationship history for MSHA mine 3304160

Current hierarchy: **Olen Corporation → The Olen Corporation → St. Louisville 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:** Gail J  Wolfe → St. Louisville Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Olen Corporation → St. Louisville Plant; 1983-05-31 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Dry Creek Crushed Gravel Company → St. Louisville Plant; 1989-04-01 to 1995-12-11; source msha-controller-operator-history
- **controller_controls_operator:** Gail J  Wolfe → Dry Creek Crushed Gravel Company; 1989-04-01 to 1995-12-11; source msha-controller-operator-history
- **operator_operates_mine:** The Olen Corporation → St. Louisville Plant; 1995-12-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Olen Corporation → The Olen Corporation; 1995-12-12 to current/open; source msha-controller-operator-history