# Relationship history for MSHA mine 4702644

Current hierarchy: **Adolph T Schwartz → Arthur Overgaard Inc → St Croix County Operations**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Adolph T Schwartz → St Croix County Operations; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Arthur Overgaard Inc → St Croix County Operations; 1980-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Adolph T Schwartz → Arthur Overgaard Inc; 1980-03-01 to current/open; source msha-controller-operator-history