# Relationship history for MSHA mine 2003421

Current hierarchy: **Mike T  May; Ted J  May → Lewiston Sand & Gravel Inc → CR Portable #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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Lewiston Sand & Gravel Inc → CR Portable #1; 2009-01-27 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ted J  May  et al → CR Portable #1; 2009-01-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ted J  May  et al → Lewiston Sand & Gravel Inc; 2009-01-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mike T  May  et al → Lewiston Sand & Gravel Inc; 2009-01-27 to current/open; source msha-controller-operator-history