# Relationship history for MSHA mine 1002174

Current hierarchy: **James  Johnston; Roy A  Sternes → F & H Mining → Walla Walla Mine**

- 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:** F & H Mining → Walla Walla Mine; 2009-04-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Roy A  Sternes et al → Walla Walla Mine; 2009-04-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Roy A  Sternes et al → F & H Mining; 2009-04-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James  Johnston et al → F & H Mining; 2009-04-09 to current/open; source msha-controller-operator-history