# Relationship history for MSHA mine 3300108

Current hierarchy: **Olen Corporation → The Olen Corporation → Upper Sandusky 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:** Mc Carthy Corp → Upper Sandusky Plant; 1950-01-01 to 2000-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Charles H  McCarthy → Upper Sandusky Plant; 1950-01-01 to 2000-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Charles H  McCarthy → Mc Carthy Corp; 1950-01-01 to 2000-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Olen Corporation → Upper Sandusky Plant; 1983-05-31 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** The Olen Corporation → Upper Sandusky Plant; 2000-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Olen Corporation → The Olen Corporation; 2000-04-01 to current/open; source msha-controller-operator-history