# Relationship history for MSHA mine 4502846

Current hierarchy: **Grant County - Wa → Grant County Dept Of Public Works → Titan Spoilbank**

- 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:** Grant County - Wa → Titan Spoilbank; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Grant County Dept Of Public Works → Titan Spoilbank; 1980-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Grant County - Wa → Grant County Dept Of Public Works; 1980-12-01 to current/open; source msha-controller-operator-history