# Relationship history for MSHA mine 3607044

Current hierarchy: **Mischello Matthew → Mischello Coal Company → Ryker Bank**

- 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

- **controller_controls_mine:** Mischello Matthew → Ryker Bank; 1980-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mischello Coal Company → Ryker Bank; 1980-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mischello Matthew → Mischello Coal Company; 1980-10-01 to current/open; source msha-controller-operator-history