# Relationship history for MSHA mine 0405678

Current hierarchy: **John R  Struiksma → West Coast Aggregate Supply, Inc → West Coast Aggregate Supply Inc**

- 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

- **controller_controls_mine:** Marvin J  Struiksma et al → West Coast Aggregate Supply Inc; 2000-06-19 to 2026-01-26; source msha-controller-operator-history
- **operator_operates_mine:** Mario Wilson's Screening Plant → West Coast Aggregate Supply Inc; 2006-03-01 to 2009-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Marvin J  Struiksma et al → West Coast Aggregate Supply Inc; 2006-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Marvin J  Struiksma et al → Mario Wilson's Screening Plant; 2006-03-01 to 2009-03-31; source msha-controller-operator-history
- **operator_operates_mine:** West Coast Aggregate Supply, Inc → West Coast Aggregate Supply Inc; 2009-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Marvin J  Struiksma et al → West Coast Aggregate Supply, Inc; 2009-04-01 to 2026-01-26; source msha-controller-operator-history
- **controller_controls_mine:** John R  Struiksma et al → West Coast Aggregate Supply Inc; 2026-01-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John R  Struiksma et al → West Coast Aggregate Supply, Inc; 2026-01-27 to current/open; source msha-controller-operator-history