# Relationship history for MSHA mine 4102328

Current hierarchy: **Norman D  Miller Jr → Brazosport Trucking Company Inc → Brazosport Trucking Company Incorporated**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Leggett Materials → Brazosport Trucking Company Incorporated; 1950-01-01 to 1980-06-02; source msha-controller-operator-history
- **controller_controls_mine:** Leggett J V → Brazosport Trucking Company Incorporated; 1950-01-01 to 1980-06-02; source msha-controller-operator-history
- **controller_controls_operator:** Leggett J V → Leggett Materials; 1950-01-01 to 1980-06-02; source msha-controller-operator-history
- **operator_operates_mine:** Brazosport Trucking Company Inc → Brazosport Trucking Company Incorporated; 1980-06-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Norman D  Miller Jr → Brazosport Trucking Company Incorporated; 1980-06-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Norman D  Miller Jr → Brazosport Trucking Company Inc; 1980-06-03 to current/open; source msha-controller-operator-history