# Relationship history for MSHA mine 3503811

Current hierarchy: **Ralph  Sanders; Jim  Bizak → The Gemstone → Arrowhead**

- 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:** The Gemstone → Arrowhead; 2014-03-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jim  Bizak et al → Arrowhead; 2014-03-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jim  Bizak et al → The Gemstone; 2014-03-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ralph  Sanders et al → The Gemstone; 2014-03-30 to current/open; source msha-controller-operator-history