# Relationship history for MSHA mine 3609609

Current hierarchy: **Justin  Welker; John  Welker → J & J Welker → 6 Mile**

- 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:** J & J Welker → 6 Mile; 2008-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John  Welker et al → 6 Mile; 2008-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John  Welker et al → J & J Welker; 2008-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Justin  Welker et al → J & J Welker; 2008-07-01 to current/open; source msha-controller-operator-history