# Relationship history for MSHA mine 5001549

Current hierarchy: **Shiela Ann  Hoffman → Hoffman Mining → Middle Fork Mine**

- 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:** Hoffman Mining → Middle Fork Mine; 1988-06-01 to 2016-08-22; source msha-controller-operator-history
- **controller_controls_mine:** Russell D  Hoffman → Middle Fork Mine; 1988-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Russell D  Hoffman → Hoffman Mining; 1988-06-01 to 2016-08-22; source msha-controller-operator-history
- **operator_operates_mine:** Hoffman Mining → Middle Fork Mine; 2016-08-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Shiela Ann  Hoffman → Middle Fork Mine; 2016-08-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Shiela Ann  Hoffman → Hoffman Mining; 2016-08-23 to current/open; source msha-controller-operator-history