# Relationship history for MSHA mine 4605780

Current hierarchy: **Robinson James → James Robinson → Robinson No 2 Mine**

- 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:** Robinson James → Robinson No 2 Mine; 1977-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** James Robinson → Robinson No 2 Mine; 1978-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robinson James → James Robinson; 1978-05-01 to current/open; source msha-controller-operator-history