# Relationship history for MSHA mine 3900441

Current hierarchy: **Gerald P  Sweetman → Brandon Materials Company → Brandon Materials Company**

- 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:** Brandon Ready Mix Inc → Brandon Materials Company; 1950-01-01 to 1986-06-15; source msha-controller-operator-history
- **controller_controls_mine:** Clifton E  Cronkite → Brandon Materials Company; 1950-01-01 to 1986-06-15; source msha-controller-operator-history
- **controller_controls_operator:** Clifton E  Cronkite → Brandon Ready Mix Inc; 1950-01-01 to 1986-06-15; source msha-controller-operator-history
- **operator_operates_mine:** Brandon Tea Ready Mix → Brandon Materials Company; 1986-06-16 to 1992-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Richard C  Lundin  et al → Brandon Materials Company; 1986-06-16 to 1992-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Richard C  Lundin  et al → Brandon Tea Ready Mix; 1986-06-16 to 1992-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Brandon Materials Company → Brandon Materials Company; 1992-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Gerald P  Sweetman → Brandon Materials Company; 1992-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gerald P  Sweetman → Brandon Materials Company; 1992-06-01 to current/open; source msha-controller-operator-history