# Relationship history for MSHA mine 4503348

Current hierarchy: **Don  Sorensen → Harold Sorensen Trucking Inc → CEDAR CREEK QUARRY**

- 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:** Harold Sorensen Trucking Inc → CEDAR CREEK QUARRY; 1996-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Harold  Sorensen → CEDAR CREEK QUARRY; 1996-02-01 to 2023-07-11; source msha-controller-operator-history
- **controller_controls_operator:** Harold  Sorensen → Harold Sorensen Trucking Inc; 1996-02-01 to 2023-07-11; source msha-controller-operator-history
- **controller_controls_mine:** Don  Sorensen → CEDAR CREEK QUARRY; 2023-07-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Don  Sorensen → Harold Sorensen Trucking Inc; 2023-07-12 to current/open; source msha-controller-operator-history