# Relationship history for MSHA mine 4502129

Current hierarchy: **Consolidated Gold Fields Limited → Associated Sand & Gravel Company Inc → A-400 Pit**

- 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:** Consolidated Gold Fields Limited → A-400 Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Washington State Department Of Highways → A-400 Pit; 1950-01-01 to 1980-10-20; source msha-controller-operator-history
- **controller_controls_mine:** State Of Washington → A-400 Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** State Of Washington → Washington State Department Of Highways; 1950-01-01 to 1980-10-20; source msha-controller-operator-history
- **operator_operates_mine:** Associated Sand & Gravel Company Inc → A-400 Pit; 1980-10-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Consolidated Gold Fields Limited → Associated Sand & Gravel Company Inc; 1980-10-21 to current/open; source msha-controller-operator-history