# Relationship history for MSHA mine 3605095

Current hierarchy: **Roger  Glenn; David  Glenn → Glenn Sand & Gravel Inc → CORSICA QUARRY & MILL**

- 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:** Glenn Sand & Gravel Inc → CORSICA QUARRY & MILL; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** David  Glenn  et al → CORSICA QUARRY & MILL; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David  Glenn  et al → Glenn Sand & Gravel Inc; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Roger  Glenn et al → Glenn Sand & Gravel Inc; 1950-01-01 to current/open; source msha-controller-operator-history