# Relationship history for MSHA mine 1516055

Current hierarchy: **Hudson James R → James R Hudson Coal Company → No 1 Surface**

- 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

- **operator_operates_mine:** James R Hudson Coal Company → No 1 Surface; 1987-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hudson James R → No 1 Surface; 1987-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hudson James R → James R Hudson Coal Company; 1987-05-01 to current/open; source msha-controller-operator-history