# Relationship history for MSHA mine 3100127

Current hierarchy: **Wienerberger AG → General Shale Brick, Inc. → Lee County**

- 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:** Borden Brick & Tile Company → Lee County; 1950-01-01 to 1990-02-22; source msha-controller-operator-history
- **controller_controls_mine:** Borden Brick & Tile Company → Lee County; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Borden Brick & Tile Company → Borden Brick & Tile Company; 1950-01-01 to 1990-02-22; source msha-controller-operator-history
- **controller_controls_mine:** Darden Thomas F → Lee County; 1988-11-08 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Cherokee Sanford Group Inc → Lee County; 1990-02-23 to 2000-02-09; source msha-controller-operator-history
- **controller_controls_operator:** Darden Thomas F → Cherokee Sanford Group Inc; 1990-02-23 to 2000-02-09; source msha-controller-operator-history
- **controller_controls_mine:** Wienerberger AG → Lee County; 2000-02-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Cherokee Sanford Brick → Lee County; 2000-02-10 to 2004-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Wienerberger AG → Cherokee Sanford Brick; 2000-02-10 to 2004-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Wienerberger AG → Lee County; 2002-07-19 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** General Shale Brick, Inc. → Lee County; 2004-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wienerberger AG → General Shale Brick, Inc.; 2004-07-01 to current/open; source msha-controller-operator-history