# Relationship history for MSHA mine 3401012

Current hierarchy: **Estell Thomas L → Big (4) Pit → Big (4) Pit**

- 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:** John'S Trucking Inc → Big (4) Pit; 1950-01-01 to 1987-02-05; source msha-controller-operator-history
- **controller_controls_mine:** Followwill Mike → Big (4) Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Followwill Mike → John'S Trucking Inc; 1950-01-01 to 1987-02-05; source msha-controller-operator-history
- **operator_operates_mine:** Big (4) Pit → Big (4) Pit; 1987-02-06 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Estell Thomas L Et Al → Big (4) Pit; 1987-02-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Estell Thomas L Et Al → Big (4) Pit; 1987-02-06 to current/open; source msha-controller-operator-history