# Relationship history for MSHA mine 0404209

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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Vans Rock & Sand → West Coast Aggregate Supply Inc; 1950-01-01 to 1979-01-25; source msha-controller-operator-history
- **controller_controls_mine:** Van Cautern Margaret → West Coast Aggregate Supply Inc; 1950-01-01 to 1979-01-25; source msha-controller-operator-history
- **controller_controls_operator:** Van Cautern Margaret → Vans Rock & Sand; 1950-01-01 to 1979-01-25; source msha-controller-operator-history
- **operator_operates_mine:** Valley Rock & Sand Inc → West Coast Aggregate Supply Inc; 1979-01-26 to 1984-03-13; source msha-controller-operator-history
- **controller_controls_mine:** Kenneth P  Maness → West Coast Aggregate Supply Inc; 1979-01-26 to 1984-03-13; source msha-controller-operator-history
- **controller_controls_operator:** Kenneth P  Maness → Valley Rock & Sand Inc; 1979-01-26 to 1984-03-13; source msha-controller-operator-history
- **operator_operates_mine:** Valley Gravel Inc → West Coast Aggregate Supply Inc; 1984-03-14 to 1988-06-07; source msha-controller-operator-history
- **controller_controls_mine:** Steve  Holliday → West Coast Aggregate Supply Inc; 1984-03-14 to 1988-06-07; source msha-controller-operator-history
- **controller_controls_operator:** Steve  Holliday → Valley Gravel Inc; 1984-03-14 to 1988-06-07; source msha-controller-operator-history
- **operator_operates_mine:** Valley Rock & Sand Inc → West Coast Aggregate Supply Inc; 1988-06-08 to 1992-02-29; source msha-controller-operator-history
- **controller_controls_mine:** Wayne  Reeder → West Coast Aggregate Supply Inc; 1988-06-08 to 1992-02-29; source msha-controller-operator-history
- **controller_controls_operator:** Wayne  Reeder → Valley Rock & Sand Inc; 1988-06-08 to 1992-02-29; source msha-controller-operator-history
- **operator_operates_mine:** Valley Rock & Sand Inc → West Coast Aggregate Supply Inc; 1992-03-01 to 2000-06-18; source msha-controller-operator-history
- **controller_controls_mine:** David B  Blomgren  et al → West Coast Aggregate Supply Inc; 1992-03-01 to 2000-06-18; source msha-controller-operator-history
- **controller_controls_operator:** David B  Blomgren  et al → Valley Rock & Sand Inc; 1992-03-01 to 2000-06-18; source msha-controller-operator-history
- **operator_operates_mine:** West Coast Aggregate Supply Inc → West Coast Aggregate Supply Inc; 2000-06-19 to current/open; source msha-controller-operator-history
- **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
- **controller_controls_operator:** Marvin J  Struiksma et al → West Coast Aggregate Supply Inc; 2000-06-19 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