# Relationship history for MSHA mine 3609451

Current hierarchy: **Daniel J  Joy → J J & W Coal → Kaska**

- 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:** Daniel J  Joy et al → Kaska; 2003-03-26 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** J J & W Coal → Kaska; 2006-07-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Daniel J  Joy et al → J J & W Coal; 2006-07-25 to current/open; source msha-controller-operator-history