# Relationship history for MSHA mine 0202900

Current hierarchy: **Grant H  Goodman → Rockland Materials → West Buckeye**

- 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:** Grant H  Goodman → West Buckeye; 1999-12-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Rockland Materials → West Buckeye; 2000-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Grant H  Goodman → Rockland Materials; 2000-09-01 to current/open; source msha-controller-operator-history