# Relationship history for MSHA mine 4606393

Current hierarchy: **Meredith Chester & Michael Faykus → Prosperity Mining Inc → No 1 Surface**

- 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:** B A G Coal Company Inc → No 1 Surface; 1981-10-01 to 1982-03-02; source msha-controller-operator-history
- **controller_controls_mine:** Browskey William → No 1 Surface; 1981-10-01 to 1982-03-02; source msha-controller-operator-history
- **controller_controls_operator:** Browskey William → B A G Coal Company Inc; 1981-10-01 to 1982-03-02; source msha-controller-operator-history
- **operator_operates_mine:** B A G Coal Corp Inc → No 1 Surface; 1982-03-03 to 1983-04-17; source msha-controller-operator-history
- **controller_controls_mine:** Loos Robert C → No 1 Surface; 1982-03-03 to 1983-04-17; source msha-controller-operator-history
- **controller_controls_operator:** Loos Robert C → B A G Coal Corp Inc; 1982-03-03 to 1983-04-17; source msha-controller-operator-history
- **operator_operates_mine:** Prosperity Mining Inc → No 1 Surface; 1983-04-18 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Meredith Chester & Michael Faykus → No 1 Surface; 1983-04-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Meredith Chester & Michael Faykus → Prosperity Mining Inc; 1983-04-18 to current/open; source msha-controller-operator-history