# Relationship history for MSHA mine 4201837

Current hierarchy: **James W C → James Aggregate Supply Company → 4 Mile 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** James W C → 4 Mile Pit; 1979-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** James Aggregate Supply Company → 4 Mile Pit; 1983-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James W C → James Aggregate Supply Company; 1983-08-01 to current/open; source msha-controller-operator-history