# Relationship history for MSHA mine 1401141

Current hierarchy: **Westhoff Julie → Great Bend Asphalt & Sand Inc → GREAT BEND SAND PIT**

- 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:** Westhoff Sand Company Inc → GREAT BEND SAND PIT; 1950-01-01 to 1993-11-16; source msha-controller-operator-history
- **controller_controls_mine:** Westhoff Ed → GREAT BEND SAND PIT; 1950-01-01 to 1993-11-16; source msha-controller-operator-history
- **controller_controls_operator:** Westhoff Ed → Westhoff Sand Company Inc; 1950-01-01 to 1993-11-16; source msha-controller-operator-history
- **operator_operates_mine:** Midwest Asphalt & Sand Company Inc → GREAT BEND SAND PIT; 1993-11-17 to 1994-10-16; source msha-controller-operator-history
- **controller_controls_mine:** Paul  Westhoff → GREAT BEND SAND PIT; 1993-11-17 to 1994-10-16; source msha-controller-operator-history
- **controller_controls_operator:** Paul  Westhoff → Midwest Asphalt & Sand Company Inc; 1993-11-17 to 1994-10-16; source msha-controller-operator-history
- **operator_operates_mine:** Great Bend Asphalt & Sand Inc → GREAT BEND SAND PIT; 1994-10-17 to 1997-10-13; source msha-controller-operator-history
- **controller_controls_mine:** Mc Ginty Eva → GREAT BEND SAND PIT; 1994-10-17 to 1997-10-13; source msha-controller-operator-history
- **controller_controls_operator:** Mc Ginty Eva → Great Bend Asphalt & Sand Inc; 1994-10-17 to 1997-10-13; source msha-controller-operator-history
- **operator_operates_mine:** Great Bend Asphalt & Sand Inc → GREAT BEND SAND PIT; 1997-10-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Westhoff Julie → GREAT BEND SAND PIT; 1997-10-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Westhoff Julie → Great Bend Asphalt & Sand Inc; 1997-10-14 to current/open; source msha-controller-operator-history