# Relationship history for MSHA mine 0505133

Current hierarchy: **Levi Franklin Schofield → Tower Pit → ERA - 1**

- 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:** Tower Pit → ERA - 1; 2021-02-11 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Chris  Fedrizzi et al → ERA - 1; 2021-02-11 to 2025-05-12; source msha-controller-operator-history
- **controller_controls_operator:** Chris  Fedrizzi et al → Tower Pit; 2021-02-11 to 2025-05-12; source msha-controller-operator-history
- **controller_controls_operator:** Stephen  Jewett et al → Tower Pit; 2021-02-11 to 2025-05-12; source msha-controller-operator-history
- **controller_controls_mine:** Levi Franklin Schofield → ERA - 1; 2025-05-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Levi Franklin Schofield → Tower Pit; 2025-05-13 to current/open; source msha-controller-operator-history