# Relationship history for MSHA mine 2302073

Current hierarchy: **Colas S A → Delta Asphalt Inc → Bell City Sand Pits**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Delta Asphalt Inc → Bell City Sand Pits; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Delta Asphalt Inc → Bell City Sand Pits; 1992-03-01 to 1993-01-28; source msha-controller-operator-history
- **controller_controls_operator:** Delta Asphalt Inc → Delta Asphalt Inc; 1992-03-01 to 1993-01-28; source msha-controller-operator-history
- **operator_operates_mine:** Delta Asphalt Inc → Bell City Sand Pits; 1993-01-29 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Colas S A → Bell City Sand Pits; 1993-01-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Colas S A → Delta Asphalt Inc; 1993-01-29 to current/open; source msha-controller-operator-history