# Relationship history for MSHA mine 4202096

Current hierarchy: **Gordon S  Ziegler Jr → Ziegler Chemical & Mineral Corp → I-12**

- 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

- **controller_controls_mine:** Gordon S  Ziegler Jr → I-12; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Ziegler Chemical & Mineral Corp → I-12; 1994-03-01 to 1994-06-13; source msha-controller-operator-history
- **controller_controls_operator:** Gordon S  Ziegler Jr → Ziegler Chemical & Mineral Corp; 1994-03-01 to 1994-06-13; source msha-controller-operator-history
- **operator_operates_mine:** C L D Inc → I-12; 1994-06-14 to 2000-11-30; source msha-controller-operator-history
- **controller_controls_mine:** Slaugh Clayton → I-12; 1994-06-14 to 2000-11-30; source msha-controller-operator-history
- **controller_controls_operator:** Slaugh Clayton → C L D Inc; 1994-06-14 to 2000-11-30; source msha-controller-operator-history
- **operator_operates_mine:** C & S Mining Inc → I-12; 2000-12-01 to 2001-05-02; source msha-controller-operator-history
- **controller_controls_mine:** Dall  Cook  et al → I-12; 2000-12-01 to 2001-05-02; source msha-controller-operator-history
- **controller_controls_operator:** Dall  Cook  et al → C & S Mining Inc; 2000-12-01 to 2001-05-02; source msha-controller-operator-history
- **operator_operates_mine:** Ziegler Chemical & Mineral Corp → I-12; 2001-05-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gordon S  Ziegler Jr → Ziegler Chemical & Mineral Corp; 2001-05-03 to current/open; source msha-controller-operator-history