# Relationship history for MSHA mine 4502668

Current hierarchy: **State Of Washington → Washington State Department Of Transportation → Qs-T-196 State 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:** State Of Washington → Qs-T-196 State Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Eucon Corporation → Qs-T-196 State Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** De Atley Company Inc → Qs-T-196 State Pit; 1979-01-01 to 1979-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Eucon Corporation → De Atley Company Inc; 1979-01-01 to 1979-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Washington State Department Of Transportation → Qs-T-196 State Pit; 1979-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** State Of Washington → Washington State Department Of Transportation; 1979-07-01 to current/open; source msha-controller-operator-history