# Relationship history for MSHA mine 0405062

Current hierarchy: **W (Wallace) Jaxon  Baker → Yuba River Sand & Gravel Inc → Coughlan Pit**

- 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:** W (Wallace) Jaxon  Baker → Coughlan Pit; 1987-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Yuba River Sand & Gravel Inc → Coughlan Pit; 1989-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** W (Wallace) Jaxon  Baker → Yuba River Sand & Gravel Inc; 1989-11-01 to current/open; source msha-controller-operator-history