# Relationship history for MSHA mine 1001331

Current hierarchy: **William  Zanetti → Zanetti Brothers Inc → S H 63 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:** N A Degerstrom Inc → S H 63 Pit; 1950-01-01 to 1978-09-14; source msha-controller-operator-history
- **controller_controls_mine:** N A Degerstrom → S H 63 Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** N A Degerstrom → N A Degerstrom Inc; 1950-01-01 to 1978-09-14; source msha-controller-operator-history
- **controller_controls_mine:** William  Zanetti → S H 63 Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Fausett Lovon → S H 63 Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Wallace Diamond Drill Company Inc → S H 63 Pit; 1978-09-15 to 1978-11-01; source msha-controller-operator-history
- **controller_controls_operator:** Fausett Lovon → Wallace Diamond Drill Company Inc; 1978-09-15 to 1978-11-01; source msha-controller-operator-history
- **operator_operates_mine:** Zanetti Brothers Inc → S H 63 Pit; 1978-11-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William  Zanetti → Zanetti Brothers Inc; 1978-11-02 to current/open; source msha-controller-operator-history