# Relationship history for MSHA mine 3606845

Current hierarchy: **Gioia Gary A & Bernard → Gioia Coal Company → Gioia #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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Rantovich Donald → Gioia #1; 1977-08-29 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mt Thor Minerals Inc → Gioia #1; 1979-06-01 to 1981-09-21; source msha-controller-operator-history
- **controller_controls_operator:** Rantovich Donald → Mt Thor Minerals Inc; 1979-06-01 to 1981-09-21; source msha-controller-operator-history
- **operator_operates_mine:** Gioia Coal Company → Gioia #1; 1981-09-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Gioia Gary A & Bernard → Gioia #1; 1981-09-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gioia Gary A & Bernard → Gioia Coal Company; 1981-09-22 to current/open; source msha-controller-operator-history