# Relationship history for MSHA mine 0801204

Current hierarchy: **Williamson Holding Corp → Rock-A-Way Inc → Pit 8**

- 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:** Rock-A-Way Inc → Pit 8; 1992-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Williamson Holding Corp → Pit 8; 1992-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Williamson Holding Corp → Rock-A-Way Inc; 1992-10-01 to current/open; source msha-controller-operator-history