# Relationship history for MSHA mine 3304022

Current hierarchy: **Ralph W  Anderson → Anco Mining Inc → Linden Valley**

- 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:** Ralph W  Anderson → Linden Valley; 1978-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Anco Mining Inc → Linden Valley; 1985-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ralph W  Anderson → Anco Mining Inc; 1985-08-01 to current/open; source msha-controller-operator-history