# Relationship history for MSHA mine 0404731

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

- **controller_controls_mine:** Steve  Holliday → West Coast Aggregate Supply Inc; 1984-03-14 to 1988-06-07; source msha-controller-operator-history
- **operator_operates_mine:** Valley Gravel Inc → West Coast Aggregate Supply Inc; 1984-11-01 to 1988-06-07; source msha-controller-operator-history
- **controller_controls_operator:** Steve  Holliday → Valley Gravel Inc; 1984-11-01 to 1988-06-07; source msha-controller-operator-history
- **operator_operates_mine:** R Bar C Inc → West Coast Aggregate Supply Inc; 1988-06-08 to 1991-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Wayne  Reeder → West Coast Aggregate Supply Inc; 1988-06-08 to 1991-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Wayne  Reeder → R Bar C Inc; 1988-06-08 to 1991-06-30; source msha-controller-operator-history
- **operator_operates_mine:** R-Bar-C Inc → West Coast Aggregate Supply Inc; 1991-07-01 to 2000-06-30; source msha-controller-operator-history
- **controller_controls_mine:** David B  Blomgren  et al → West Coast Aggregate Supply Inc; 1991-07-01 to 2000-06-30; source msha-controller-operator-history
- **controller_controls_operator:** David B  Blomgren  et al → R-Bar-C Inc; 1991-07-01 to 2000-06-30; 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
- **operator_operates_mine:** West Coast Aggregate Supply Inc → West Coast Aggregate Supply Inc; 2000-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Marvin J  Struiksma et al → West Coast Aggregate Supply Inc; 2000-07-01 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