# Relationship history for MSHA mine 1519620

Current hierarchy: **Kevin R  Yonts → Bitco Resources Inc. → #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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Bitco Resources Inc. → #1; 2011-09-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kevin R  Yonts et al → #1; 2011-09-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kevin R  Yonts et al → Bitco Resources Inc.; 2011-09-08 to current/open; source msha-controller-operator-history