# Relationship history for MSHA mine 0900970

Current hierarchy: **Kathy T  Banks → Turner Concrete, Inc → BROAD RIVER SAND CO.**

- 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:** Kathy T  Banks → BROAD RIVER SAND CO.; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Williams Sand Company Inc → BROAD RIVER SAND CO.; 1985-06-01 to 1994-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Tony  Williams → BROAD RIVER SAND CO.; 1985-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tony  Williams → Williams Sand Company Inc; 1985-06-01 to 1994-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Turner Concrete, Inc → BROAD RIVER SAND CO.; 1995-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kathy T  Banks → Turner Concrete, Inc; 1995-01-01 to current/open; source msha-controller-operator-history