# Relationship history for MSHA mine 3100260

Current hierarchy: **Boren Clay Products Company → Boren Clay Products → Fletcher Mine**

- 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:** Boren Clay Products Company → Fletcher Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Fletcher Brick Company Inc → Fletcher Mine; 1950-01-01 to 1987-12-14; source msha-controller-operator-history
- **controller_controls_mine:** Todd Betty Anne → Fletcher Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Todd Betty Anne → Fletcher Brick Company Inc; 1950-01-01 to 1987-12-14; source msha-controller-operator-history
- **operator_operates_mine:** Boren Clay Products → Fletcher Mine; 1987-12-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Boren Clay Products Company → Boren Clay Products; 1987-12-15 to current/open; source msha-controller-operator-history