# Relationship history for MSHA mine 3503052

Current hierarchy: **Maier Franz L → Kola Mining Corp → Auropa Mine**

- 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:** Rich Gallagher → Auropa Mine; 1981-03-01 to 1982-04-04; source msha-controller-operator-history
- **controller_controls_mine:** Gallagher Rich → Auropa Mine; 1981-03-01 to 1982-04-04; source msha-controller-operator-history
- **controller_controls_operator:** Gallagher Rich → Rich Gallagher; 1981-03-01 to 1982-04-04; source msha-controller-operator-history
- **operator_operates_mine:** Mine Management Partnership → Auropa Mine; 1982-04-05 to 1990-02-05; source msha-controller-operator-history
- **controller_controls_mine:** Oscar  Nukka → Auropa Mine; 1982-04-05 to 1990-02-05; source msha-controller-operator-history
- **controller_controls_operator:** Oscar  Nukka → Mine Management Partnership; 1982-04-05 to 1990-02-05; source msha-controller-operator-history
- **operator_operates_mine:** Kola Mining Corp → Auropa Mine; 1990-02-06 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Maier Franz L → Auropa Mine; 1990-02-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Maier Franz L → Kola Mining Corp; 1990-02-06 to current/open; source msha-controller-operator-history