# Relationship history for MSHA mine 0202488

Current hierarchy: **Threse  Sanders → Desert Concrete Company → Desert Concrete Wash Plant**

- 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

- **operator_operates_mine:** Desert Concrete Company → Desert Concrete Wash Plant; 1989-06-01 to 1994-07-07; source msha-controller-operator-history
- **controller_controls_mine:** Clyde E  Davis → Desert Concrete Wash Plant; 1989-06-01 to 1994-07-07; source msha-controller-operator-history
- **controller_controls_operator:** Clyde E  Davis → Desert Concrete Company; 1989-06-01 to 1994-07-07; source msha-controller-operator-history
- **operator_operates_mine:** Desert Concrete Company → Desert Concrete Wash Plant; 1994-07-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Threse  Sanders → Desert Concrete Wash Plant; 1994-07-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Threse  Sanders → Desert Concrete Company; 1994-07-08 to current/open; source msha-controller-operator-history