# Relationship history for MSHA mine 3002570

Current hierarchy: **Andrews Charles J → Charles J Andrews → Clapp Hill Gravel Bank**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Charles J Andrews → Clapp Hill Gravel Bank; 1980-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Andrews Charles J → Clapp Hill Gravel Bank; 1980-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Andrews Charles J → Charles J Andrews; 1980-09-01 to current/open; source msha-controller-operator-history