# Relationship history for MSHA mine 3606125

Current hierarchy: **Pogirski Edward & Stanley → E & S Coal Company → Mammoth Middle Split Slope**

- 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:** Walaitis Coal Company Inc → Mammoth Middle Split Slope; 1976-06-22 to 1977-02-01; source msha-controller-operator-history
- **controller_controls_mine:** Walaitis John Et Al → Mammoth Middle Split Slope; 1976-06-22 to 1977-02-01; source msha-controller-operator-history
- **controller_controls_operator:** Walaitis John Et Al → Walaitis Coal Company Inc; 1976-06-22 to 1977-02-01; source msha-controller-operator-history
- **operator_operates_mine:** E & S Coal Company → Mammoth Middle Split Slope; 1977-02-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Pogirski Edward & Stanley → Mammoth Middle Split Slope; 1977-02-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Pogirski Edward & Stanley → E & S Coal Company; 1977-02-02 to current/open; source msha-controller-operator-history