# Relationship history for MSHA mine 2102853

Current hierarchy: **James A  Anderson → Anderson Brothers Construction Company → Skone 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Anderson Brothers Construction Company → Skone Pit; 1981-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** James A  Anderson → Skone Pit; 1997-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James A  Anderson → Anderson Brothers Construction Company; 1997-05-01 to current/open; source msha-controller-operator-history