# Relationship history for MSHA mine 4503459

Current hierarchy: **Donn (Ted) Theodore  Salka → Farwest Portable Crushing, Inc. → Barnes Drive 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Harold  Sorensen → Barnes Drive Quarry; 1996-02-01 to 2023-07-11; source msha-controller-operator-history
- **operator_operates_mine:** Harold Sorensen Trucking Inc → Barnes Drive Quarry; 2000-12-01 to 2020-04-05; source msha-controller-operator-history
- **controller_controls_operator:** Harold  Sorensen → Harold Sorensen Trucking Inc; 2000-12-01 to 2020-04-05; source msha-controller-operator-history
- **controller_controls_mine:** Donn (Ted) Theodore  Salka → Barnes Drive Quarry; 2006-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Farwest Portable Crushing, Inc. → Barnes Drive Quarry; 2020-04-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Donn (Ted) Theodore  Salka → Farwest Portable Crushing, Inc.; 2020-04-06 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Don  Sorensen → Barnes Drive 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 2020-04-05; source msha-controller-operator-history