# Relationship history for MSHA mine 0202143

Current hierarchy: **Uranerzbergbau Gmbh → Uranerz U S A Inc → Tip Top Adit - Denver Hill**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Uranerzbergbau Gmbh → Tip Top Adit - Denver Hill; 1981-12-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Uranerz U S A Inc → Tip Top Adit - Denver Hill; 1983-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Uranerzbergbau Gmbh → Uranerz U S A Inc; 1983-03-01 to current/open; source msha-controller-operator-history