# Relationship history for MSHA mine 3303315

Current hierarchy: **Massimino Andy → Joyce Coal Company → Crescent 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Joyce Coal Company → Crescent Strip; 1975-05-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Massimino Andy → Crescent Strip; 1975-05-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Massimino Andy → Joyce Coal Company; 1975-05-15 to current/open; source msha-controller-operator-history