# Relationship history for MSHA mine 3605693

Current hierarchy: **Del Rizzo Joseph → Ardel Natural Resources (Pa) Inc → Ardel No 1 Strip**

- 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:** Ardel Natural Resources (Pa) Inc → Ardel No 1 Strip; 1975-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Del Rizzo Joseph → Ardel No 1 Strip; 1975-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Del Rizzo Joseph → Ardel Natural Resources (Pa) Inc; 1975-08-01 to current/open; source msha-controller-operator-history