# Relationship history for MSHA mine 1514430

Current hierarchy: **Simpson William-John & James → S & S Coal Company → No 2**

- 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

- **operator_operates_mine:** S & S Coal Company → No 2; 1984-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Simpson William-John & James → No 2; 1984-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Simpson William-John & James → S & S Coal Company; 1984-01-01 to current/open; source msha-controller-operator-history