# Relationship history for MSHA mine 0503678

Current hierarchy: **Stanfield H K → Cumberland Resources Inc → Cumberland-Monitor**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Cumberland Resources Inc → Cumberland-Monitor; 1981-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Stanfield H K → Cumberland-Monitor; 1981-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stanfield H K → Cumberland Resources Inc; 1981-04-01 to current/open; source msha-controller-operator-history