# Relationship history for MSHA mine 3200836

Current hierarchy: **Steve  Farden → Farden Construction Inc → Wash Plant #6**

- 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:** Timothy A  Harris et al → Wash Plant #6; 1987-05-11 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Steve  Farden et al → Wash Plant #6; 1993-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Harris Graveling Inc → Wash Plant #6; 2008-05-23 to 2013-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Timothy A  Harris et al → Harris Graveling Inc; 2008-05-23 to 2013-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Kirk J  Harris et al → Harris Graveling Inc; 2008-05-23 to 2013-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Farden Construction Inc → Wash Plant #6; 2014-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Steve  Farden et al → Farden Construction Inc; 2014-01-01 to current/open; source msha-controller-operator-history