# Relationship history for MSHA mine 1800582

Current hierarchy: **Westvaco Corp → Westvaco Resources Inc → Franklin Hill #1**

- 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:** Westvaco Resources Inc → Franklin Hill #1; 1975-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Westvaco Corp → Franklin Hill #1; 1975-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Westvaco Corp → Westvaco Resources Inc; 1975-08-01 to current/open; source msha-controller-operator-history