# Relationship history for MSHA mine 0405755

Current hierarchy: **Mark E  Gavard; Thomas  Nicholas → Wabuska Mining LLC → High Bar Placer**

- 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:** Wabuska Mining LLC → High Bar Placer; 2008-04-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Thomas  Nicholas et al → High Bar Placer; 2008-04-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thomas  Nicholas et al → Wabuska Mining LLC; 2008-04-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mark E  Gavard et al → Wabuska Mining LLC; 2008-04-30 to current/open; source msha-controller-operator-history