# Relationship history for MSHA mine 2400943

Current hierarchy: **Sued-Chemie AG → Southern Talc Company → Greenhorn Mine**

- 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:** Resource Processors Inc → Greenhorn Mine; 1950-01-01 to 1986-05-12; source msha-controller-operator-history
- **controller_controls_mine:** Bixby Peter H → Greenhorn Mine; 1950-01-01 to 1986-05-12; source msha-controller-operator-history
- **controller_controls_operator:** Bixby Peter H → Resource Processors Inc; 1950-01-01 to 1986-05-12; source msha-controller-operator-history
- **controller_controls_mine:** Sued-Chemie AG → Greenhorn Mine; 1986-02-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Willow Creek Talc Inc → Greenhorn Mine; 1986-05-13 to 1990-06-11; source msha-controller-operator-history
- **controller_controls_mine:** Woodward & Dickerson → Greenhorn Mine; 1986-05-13 to 1990-06-11; source msha-controller-operator-history
- **controller_controls_operator:** Woodward & Dickerson → Willow Creek Talc Inc; 1986-05-13 to 1990-06-11; source msha-controller-operator-history
- **operator_operates_mine:** Southern Talc Company → Greenhorn Mine; 1990-06-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sued-Chemie AG → Southern Talc Company; 1990-06-12 to current/open; source msha-controller-operator-history