# Relationship history for MSHA mine 4703376

Current hierarchy: **Patrick J  Strachan; James  Gilbert → Cedar Lake Sand & Gravel → Portable Wash Plant 1**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Eric  Gilbert → Portable Wash Plant 1; 1950-01-01 to 2014-12-23; source msha-controller-operator-history
- **operator_operates_mine:** Cedar Lake Sand & Gravel → Portable Wash Plant 1; 2004-03-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Eric  Gilbert → Cedar Lake Sand & Gravel; 2004-03-30 to 2014-12-23; source msha-controller-operator-history
- **controller_controls_mine:** Patrick J  Strachan et al → Portable Wash Plant 1; 2014-12-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Patrick J  Strachan et al → Cedar Lake Sand & Gravel; 2014-12-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James  Gilbert et al → Cedar Lake Sand & Gravel; 2014-12-24 to current/open; source msha-controller-operator-history