# Relationship history for MSHA mine 4801289

Current hierarchy: **Raymond W  DeVries → Canyon Concrete Sand & Gravel → 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:** Canyon Concrete & Excavating Inc → Wash Plant; 1979-01-01 to 1994-04-03; source msha-controller-operator-history
- **controller_controls_mine:** Fred C  Hanson Jr  et al → Wash Plant; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Fred C  Hanson Jr  et al → Canyon Concrete & Excavating Inc; 1979-01-01 to 1994-04-03; source msha-controller-operator-history
- **controller_controls_operator:** Geneva M  Hanson  et al → Canyon Concrete & Excavating Inc; 1979-01-01 to 1994-04-03; source msha-controller-operator-history
- **operator_operates_mine:** Canyon Concrete Sand & Gravel → Wash Plant; 1994-04-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Raymond W  DeVries → Wash Plant; 1994-04-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Raymond W  DeVries → Canyon Concrete Sand & Gravel; 1994-04-04 to current/open; source msha-controller-operator-history