# Relationship history for MSHA mine 0504659

Current hierarchy: **Merle W  Weaver → Cmc Weaver Trucking Inc → Portable Grizzley**

- 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:** Cmc Weaver Trucking Inc → Portable Grizzley; 1999-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Merle W  Weaver → Portable Grizzley; 1999-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Merle W  Weaver → Cmc Weaver Trucking Inc; 1999-10-01 to current/open; source msha-controller-operator-history