# Relationship history for MSHA mine 3609124

Current hierarchy: **Michael  Supko → Myers & Supko → Myers and Supko**

- 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:** Myers & Supko → Myers and Supko; 2003-02-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Michael  Supko et al → Myers and Supko; 2003-02-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael  Supko et al → Myers & Supko; 2003-02-14 to current/open; source msha-controller-operator-history